Taking 57 new spring wheat strains as test materials, and Yongliang4 （CK1）, Nongmai2 （CK2） , Nongmai5 （CK3） as the control, the growth period of wheat, disease resistance, grain traits and plant agronomic traits and grain yield, the correlation of agronomic traits and grain yield and contribution of yield components were studied. The resuhs showed that the new varieties of increased yield were 2017j22, 2017j51 and 2017j52 compared with the three controls. In terms of tile growth period, these three strains have a growth period of nearly 90 days. In terms of disease resistance, leaf＇ rust is light or mediunl in these three strains. From the agronomic characters analysis, the three strains were characterized by groups, plant height between 75.3-82.1 era, plant number between 649.5-733.5 ten thousand/hm^2, tiller number between 466.5-594.0 ten thousand/hm^2, effective panicles between 36.1%-44.4%, the number of spike in 31.1-39.6 ten thousand/hm^2, 1000-grain weight between 38.1-39.7 grams, spike grain number between 35.9-45.5 grains/spike. At the same time, the cmTelation between grain number and grain yield was the largest, and the correlation coefficient reached 0.432.The diameter analysis showed that the number of grain per spike was the greatest contribution to grain yield, which was 1.846. The second was the nmnber of spike,and the contribution rate was 1.205. The indirect effect of the yield component was negative, and no contribution was shown. According to the analysis resuhs and the ecological conditions of Hohhot, the selection of new varieties of spring wheat should be based on the number of high panicle grains, while the number of panicles should be stable and the 1 000-grain weight should be increased.

To reveal the effects of different planting densities on dry matter accumulation, yield, and yield traits of medium-mature spring maize variety Guangde 5. the five density levels of Guangde 5 were taken as the object in this study, and 60 000,67 500,75 000,82 500,90 000 plants/hm^2 density were analyzed. The efteet of treatment on plant height, leaf area, dry matter accumulation, harvest index, yield, and yield traits of spring maize. The results showed that with the increase of the density, the plant height of Guangde 5 increased first and then decreased with the change trend of the single peak curve, and the plant height treated with 75 000 plants/hm^2, was the largest; the leaf area index increased gradually with the increase of the density-, and was larger. Before the trumpet stage, the difference was smalh The leaf area index under each density treatment at the beginning of the trumpet period was 90,000 plants/hm^2〉82 500 plants/hm^2〉 75 000 plants/hm^2〉67 500 plants/hm^2〉60 000 plants/hm^2;with the increase of the density-, the dry matter and population of substances gradually increased along with the growth period. The order of different planting densities on dry matter and population dry matter at different growth stages was 60 000 plants/hm^2〉67 500 plants/bm^2〉75 000 plants/hm^2〉82 500 plants/hm^2〉 and 90 000 plants/hm^2 and 75 000 plants/hm^2〉67 500 plants/hm^2〉82 500 plants/hm^2〉60 000 plants/hm^2〉90 000 plants/hm^2.The maximum grain yield and net yield of the 75 000 plants/hm^2, its value is 17 959.33 kg/hm^2 and 15 422.75 yuaan/hm^2. According to the comprehensive analysis of dry matter accunmlation, grain yield and net yield, the suitable planting density of Cuangde 5 is around 75 000 plants/hm^2.

To select maize varieties with tast kernel dehydration rate, 23 early-maturing maize high-generation lines and 4 inbred lines were used as experimental materials, and 92 combinations were used tor incomplete double-cross hybrid design to assess their ear yield traits and spikes. The 8 indicators were correlated with the dehydration rate of mature kernel by related analysis and path analysis. The resuhs showed that the ear coarseness, axis coarseness, kernel length, and 100- kernel weight were all significantly negatively correlated with the kernel dehydration rate ;the spike length was negatively correlated with the kernel dehydration rate but not significantly ; the water content of the coriander leaves during ripening and the water content of the kernel during harvest were all significantly negatively correlated with the kernel dehydration rate. The resuhs of path analysis showed that the direct pass coefficient of kernel length, axis thickness, ear diameter, kernel weight and kernel dehydration rate was negative; the coefficient of the water content of kernel during harvest and the moisture content of the coriander leaves was negative. When breeding fast dehydrated varieties, the ear should be chosen smaller and 100-kernel weight should not be too large and the combination of low moisture content of mature leaves.

In order to find common buckwheat varieties and their supporting cultivation techniques suitable for cultivation in the eastern and western Inner Mongolia,six factors including five variety, sowing date, seeding rate, nitrogen fertilizer, phosphate fertilizer and potassium fertilizer were designed at 5 level orthogonal experiment, the experiment was continued planting in Naiman and Guyang bases for 2 years,the results showed that new varieties suitable for planting in the eastern part of Inner Mongolia area was Mongolian 1202-3, The supporting cultivation technology was sowing date on June 29, and seeding amount was 45 kg/hm^2, nitrogen fertilizer was 60 kg/hm^2 and potassium fertilizer was 67.5 kg/hm^2. The common buckwheat varieties suitable for planting in western area is born in the North, and the supporting cultivation techniques was sowing date on May 23, sowing amount was 45 kg/hm^2,it need nitrogen fertilizer 75 kg/hm^2, phosphate fertilizer was 30 kg/hm^2, potassium fertilizer was 90 kg/hm^2,it is clear that the key factor influencing the yield of common buckwheat among the six factors is sowing date,the meteorological factor and yield show that meteorological factor with the largest correlation coefficient is accumulated temperature.

In order to explore the effects of rotation and fallow on soil volumetric moisture content and crop yield in the West of the Great Khingan, the experiment on the different rotation model with wheat and rape was carried out in the Tenihe experiment station in 2017. The results showed thai the soil volumelric moisture and water use efficiency of comfield and rape field under rotation in fallow mode at difterent growth stages were much greater than that of continuous cropping, and the number of spike and number of kernels of wheat and effective pod number per plant and seed number per pod of rapeseed also showed fallow〉rotation〉continnous cropping. The yield of wheat and rape in the following year after fallow, and the yield reached 4 670.17 kg/hm^2 and 3 296.20 kg/hm^2, respectively, which was significantly higher than that of the control continuous cropping wheat and rape and rape-wheat and wheat-rape rotation patterns.

Six sowing periods were set for La2577 and Nongmai No.4 to study the reproductive process, agronomic characters, grain yield and drought resistance of difterent early-maturing spring wheat varieties in Hulun Buir area. The results showed that the grain yield of La2577 and Nongmai No.4, sowed on May 30, were the highest, which were 5 393.55 and 5 353.65 kg/hm^2 respectively. Difterent sowing periods had a great impact on the growth and development of early maturity wheat varieties for further analysis, with the retardation of sowing period, wheat growth period was extended, and the agronomic characters such as plant height, panicle number, 1 000-grain weight, ear number per unit area and bulk density- were improved to varying degrees, and the drought resistance and disease resistance of wheat were enhanced to difterent degrees. In conclusion, moderate late sowing of early maturity varieties can avoid drought in early spring and meeting rain to grow, prolong the growth period, maintain high panicle number, ear number per unit area and 1000-grain weight and other yield components, so as to ensure high grain yield.

In recent years,Chinese govemnmnt had bean made strategic adjustments to the planting structure in the Sickle Bay- area, in order to reduce corn planting area and increase soybean planting area, especially developing the early maturity soybean production in the north-eastern high-cold area. Scholars had bean done a lot of researches on the agronomic traits, ripening period, and variety- breeding of early-season soybeans. The previous studies on the early maturity soybean in significance of the development, ecological characteristics, breeding objectives and variety- breeding in China were summarized and the breeding methods and direction were investigated in order to provide reterence tor breeding and cultivation of early-maturing soybeans.

In order to clarify the genolypes differenee of activation and utilization characteristics to inorganic Phosphorus, phosphorus efficient genotype 56 and Phosphorus inefficient genotype 60 were used. The potted soil experiment was employed to evaluate their differences in plant,shoot and root phosphorus content, root/ shoot ratio, inorganic phosphorus fractions under three inorganic phosphorus named Al-P、Fe-P、K-P. Results showed that shoot phosphorus content of phosphorus efficient genotype 56 higher than Phosphorus inefficient genotype 60; the availability of three inorganic phosphorus supplies to two oats genolype is K-P〉Al-P〉Fe-P; Phosphorus efficient genotype 56 had stronger ability to utilize and assimilate OH-Pi,dil.HCl-Pi than phosphorus inefficient genotype 60 in soil; the difference in the activation and utilization of inorganic phosphorus was shown on the two insoluble inorganic phosphorus supplies and it found that phosphorus utilization efficieney of phosphorus efficient genotype 56 was higher than that with phosphorus inefficient genotype 60 under three inorganic phosphorus.

By setting up 8 treatments of nitrogen （CK）, comnlon urea （U）, hunfic acid urea （HI, H2, H3, H4, H5）, and 10% （H3-10%） reduction of humic acid urea, the effect of humic acid adeled urea on increasing yield and reducing nitrogen input in corn production than ordinary urea was explored. The results are as tollows： the amount of nitrogen accumulation in ditterent organs and the nitrogen uptake per plant increased by 5 types of humic acid urea compared with conventional urea, and the nitrogen uptake per unit area increased by 4.16%-16.90%. The nitrogen distribution in the stem, leaf and other organs increased except the grain nitrogen distribution. The number of grain per spike and 100 grain weight of the 5 models of humic acid urea increased, the yield increased by 6.72%-12.89% , the utilization effociency of nitrogen tertilizer increased, and the total nitrogen content of soil decreased by 10.81%-17.66% after harvest. The amount of nitrogen accumulation in ditterent organs and the nitrogen absorpotion per plant increased, the nitrogen uptake per unit area increased by 27.70%, the grain and leaf nitrogen distribution decreased, and the nitrogen distribution in the stem and other organs increased, and the number of grains per spike and 100 grain weight was increased by humic acid （H3） urea reduction by 10%, yield increased by 14.32% compared with conventional urea, nitrogen use efficiency increased, and total nitrogen content decreased by 18.72% after harvest.

Maize is the main crop in the Loess Plateau. Farmers invest heavily in tertilizers to obtain higher yields, which resuhs in deterioration of soil physical and chemical properties and reduced crop yields. Application of organic manure is one of the effective measures. Five treatments were designed for this experiment. The organic fertilizer dosages were 0 kg/hm^2 （M0）, 11 250 kg/hm^2 （M1）, 22 500 kg/hm^2 （M2）, 33 750 kg/hm^2 （M3） and 45 000 kg/hm^2 （M4）. Analysis of differences in leaf area index, material production, water use, and yield formation of difterent treatments showed that： the application of chemical fertilizers combined with organic fertilizer can significantly increase the leaf area index, dry matter accumulation, water use efficiency, and yield of maize plants. When the fertilizer application rate was 22 500 kg/hm^2, various indicators performed well. The leaf area index was 4.58, which was 8.30% higher than that of the control; the dry matter accumulation was 513 g/plant, which was 8.20% higher than the control; the water use efficiency was 25.98 kg/（mm·hm^2）, 31.40% higher than the control, and the grain yield was 10 136.20 kg/hm^2, 30.25% higher than the control. Therefbre, increasing 22 500 kg/hm^2 of organic fertilizer can be an efteetive technical measure to increase the local maize yield potential.

The corn stalks were returned to the field by nylon mesh bag embedding method to study the degradation rate of corn stalks and soil nutrient release characteristics. The effects of corn stalks on corn yield and quality characteristics were analyzed to optimize the utilization of corn stalk degrading bacteria, in order to provide technical support for the rational utilization of corn stalk resources and the application of microbial agents, the results showed that the degradation rate of corn stalk with stalk degrading bacteria was significantly higher than that without stalk degrading bacteria. Soil nutrients in difterent periods showed a trend of first increase and then decrease. The nutrient release was the highest in the soils treated with stalk degrading composite bacteria GF-20, and the degradation rate of soil available nitrogen, soil available potassium, soil available phosphorus, soil organic matter was higher than that of the control. They increased by 21.39 mg/kg, 62.82 mg/kg, 6.86 mg/kg, 4.41 g/kg in 30 days, respectively, and reached significant difterenee. The number of grain and 1000 grain weight of corn treated with stalk degrading bacteria GF-20 were significantly improved, were increased by 16.36% and 3.16% compared to no bacterial treatment, respectively. The application of straw degrading bacteria corn grain protein and starch content was significantly higher than that of straw not returning to the field, which could improve yield and quality of corn to some extent.

Drought, cold, salt and so on are the common adverse factors in the growth and development of crops. The growth and yield of crops are affected by these adverse factors, so more and more researchers are keen on the research of crop resistance to stress. LEA protein （late embryonic development rich protein） belongs to stress response protein, which is widely found in plants. This article is a brief review of the distribution, classification and function of LEA protein and the reearch progress of LEA protein in the process of crop resistance.

In order to verify the control eflects of Imidazolinone （IMI） herbicides application to the sunflower broomrape （Orobanche cumana Walln） on Xinshiyihao,which a novel IMI-resistant sunflower variety. 5% Imazethapyr （AS） and 4% Imazamox （AS） were applied at the dosage of 750,1 500,2 250,3 000 mL/hm^2 based on 450 L water/hm^2 at 4-6 leaf stage, 6-8 leaf stage, 8-10 leaf stage of sunflower respectively. According to the parasitism investigation results at 20 clays and 35 days after herbicide application, the sunflower broomrape were well controlled. The best control effect （100%） was achieved in the case of herbicide was applied at the dosage of 750 mL/hm^2 and at the 4-8 leaf stage of sunflower growth, and it is safe to sunflower.

In order to detect whether B. amyloliquefaciens could help plant against the infection of Pst DC3000, using petri dish and pot experiments to analyze the efficiency of B. amyloliquefaciens against the Pst DC3000 infection process in Arabidopsis thaliana. The results showed B. amyloliquefoz.ieus inhibited the growth of＇ Pst DC3000 in petri dish condition. After spayed of Pst DC3000, leaves with pre-treatment, irrigated or sprayed with B. amyloliquefoz.ieus, wilted later than control and the count of Pst DC3000 in leaves were less than control. In conclusion, B. amyloliquefoz.ieus has good inhibition efficieney against Pst DC3000 in petri dish or plants. The study provides experimental basis for further analyze the mechanism of biological control of B. amyloliquefacieus.

We have developed a TAS-ELISA kit for detecting Arabis mosaic virus （ArMV）. In order to avoid the dispersion of ArMV to the environment,a goat anti-mice polyelonal antibody in the kit was used as positive control ahernative for ArMV to monitor the whole ELISA reaction system. Finally, the feasibility of this study is verified by molecular biology.

In order to protect agricultural ecological environment and optimize the dosage of herbicides, 40% cyanamide acetochlor herbicide was used in this experiment to set up three different doses for treatment, in order to obtain the ideal effective dose for reduction. The results showed that 40% cyanamide acetochlor herbicide was reduced by 15% on the basis of conventional dosage, which had the stone effect as the conventional dosage, the emergence rate was 91.53%, the control efficiency which the number of weeds and fresh weight of weeds were 91.98% and 91.45.%, respectively,and the yield was at 9 623.72 kg/hm^2. Therefore, in order to achieve better ecological and economic benefits in maize production in southeastern Shanxi, this herbicide can be used up to 15%.

Based on grid meteorological predict element,NDSI index,DEM data and socio-econonffc data,the refined prediction of snow disaster risking of animal husbandPy was constructed by the theory of natural disaster risking. The GIS raster computing tool was used to calculate the average risk of snow disaster in the next ten days. The results are consistent with the distribution of disaster causing factors, and the actual situation is matching basically. However, the lack of refined industrial struetm＇e data and livestock distribution data has great influence on aeem＇aey, which is an important drawback that models need to solve re＇gently. Tiffs study combines the factors as the grid prediction, the animal husbandry production activities and tire soeio- economic conditions. Tire results are scientific and pertinent, and can effectively improve the meteorological service efteet, it is a positive exploration of prediction of the risk of snow disaster in animal husbandry.

In this paper, some research resuhs and basic theories of currently agricultural meteorological disaster risk assessment were comprehensively discussed, focusing on basic contents and technical methods of meteorological disaster risk assessment, the research progress of agrieuhural meteorological disaster risk assessment was summarized, the hot research direction in the future was pointed out, and the aim is to provide some theories for the establishment of meteorological disaster risk assessment system.

The effects of different grazing methods on the fluxs of carbon dioxide （CO2） and methane （CH4） were measured to estimate source or sink of greenhouse gases in desert steppe, in order to forther provide theoretical reference to formulate reasonable grazing system. This experiment was foeused on different grazing treatments （sheep grazing alone SG 15 sheep; tufty cattle grazing CG 3 head of cattle; both cattle and sheep MG 15 sheep and 3 cattle; no grazing CK） to research and analysis soil atmospheric fluxes of CO2 and CH4 using static chamber gas chromatography method from Jun to September 2016 in XiLaMuRen desert steppe. The resuhs showed that the soil of the desert steppe was the CO2 source and the CH4 sink. There were not significant effects of four grazing treatment on soil CO2 emissions, and CO2 flux order is CK〉CG〉SG〉 MG. Grazing treatments affected the soil CH4 flux significantly, and order is MG〉CG〉SG〉CK, indicating MG is benefit for reducing greenhouse gas emission.

In this paper, mixed-sowing artificial grassland in the temperate agro-pastoral zone is taken as the research object, The changes of aboveground and underground biomass of Leymus chinensis and Medicago sativa L. under ditterent grazing patterns were analyzed. The effects of carbon allocation on dominant species and carbon density of artificial grassland were researched. The results indicated that rotational grazing can ettectively relieve the grassland pressure, and a reasonable grazing system can improve the grassland productivity. The palatability of sheep changed with the ditterent grazing systems. Grazing patterns have ditterent effects on grassland vegetation carbon density and soil carbon density. As a result of continue grazing, both the carbon density and soil carbon density of grassland vegetation were significantly reduced, and the rotational grazing was at the same level as that of the management of grazing prohibition. In the tested artificial grassland, the ditterent grazing systems have significant effects on pasture productivity and carbon density. Soil carbon density accounts tor a large proportion of the carbon density in artificial grassland and decreases with the increasing of soil depth.

With black seed pumpkin, white pumpkin seeds and ＂Jinyou NO35＂ cucumber as test materials,at the optimunl temperature （18-20℃, CK） and warn1 （13-15 ℃） at low temperature （8-10℃） of root zone temperature conditions, the grafting cucumber and the seedling leaf net photosynthetic rate and chlorophyll fluorescence parameters of the diurnal variation were studied. The resuhs showed that compared with optimal temperature （CK）, with the loss of the root zone temperature, cucumber leaf net photosynthetic rate （Pn）, PS Ⅱ maximum photochemical efficiency （Fv/Fm） and photochemical quenching parameters （qP） and photochemical quenching （NPQ） parameters were significantly reduced. The optimum under moderate low temperature treatment, the black seed pumpkin grafting of net photosynthetic rate （Pn） and chlorophyll fluorescence parameters were higher than white pumpkin seed grafting and seedling, under low temperature stress, the black seed grafting retrograde resistance is better than that of white pumpkin seed grafting and the seedling, light energy utilization can be maintained at a relatively high level.

Taking the traditional ＂43 model＂ solar greenhouse as the research object, seven measures were taken to improve the greenhouse performance. The temperature and ground temperature of the greenhouse were monitored in the first half of January, and the early cultivation of cucumber was promoted in the last half of January. The rectification effect, harvest time, yield and benefit of cucumber were compared and analyzed, which provided the basis for the vast number of growers to obtain high yield and maximum economic benefit of cucumber. The results showed that the heat storage and insulation capacity of the optimized solar greenhouse were obviously improved,and the lowest temperature deviation was less than 30%, and the temperature fluctuation was small. In the middle of January, the temperature in the greenhouse was stable through 10℃ and the ground temperature in the 20 cm tillage layer reached 12℃. The greenhouse had the planting conditions for fruit vegetables. Cucumber planting started on January 20, 15 days ahead of CK, 19 days ahead of the initial harvest period and 23 days ahead of the full fruit period. By the end of May, cucumber harvested at 136 200 kg/hm^2 which was 25.8 % higher than CK, realizing 470 800 yuan/hm^2 and increase of 325 400 yuan/hm^2 compared with CK.

Alfalfa, a genus of the genus Eucalyptus, is rich in minerals, protein and vitamins. These characteristics make it an ideal choice tor livestock teed, and because of its high grass yield, long lite, and regeneration. It has the advantages of strong sex and strong palatability, and is known as the ＂king of the pasture＂. In addition, alfalfa contains a variety of active ingredients, including： minerals, amino acids, non-protein amino acids, organic acids, polyols, alkaloids, carotene, coumarin, digestive enzymes, flavonoids, phenolic compounds, plants Estrogen, phytosterols, polyamines, saponins and other volatile organic compounds such as terpenes, turans, alcohols and ketones. In this paper, the functions of the active constituents of altalfa and their analytical methods were reviewed. The active constituents of altalfa were divided into three types： minerals, primary metabolites and secondary metabolites. The types of specific compounds, the physiological functions of the active ingredients, and the related analytical techniques, and the ettective analysis methods for various active compound components in altalth, aim to provide an advantageous technical reterence tor scientific research in future alfalfa active substances.

Agricuhure is directly related to national food safety, resource safety and ecological safeU. Inner Mongolia is an important ecological safety battier in northern China and also an important base tot production, processing and export of green agrieultural and livestock products. Based on an in-depth analysis of the current situation and existing problems of inner Mongolia agrieulture, eountermeasures and suggestions tor sustainable development of Inner Mongolia agrieulture were put torward in this paper.