Abstract:

【Objective】To investigate the effects of tillage practices，irrigation amount and their interaction on the growth，development and yield of wheat.【Methods】Two factors，tillage practices and irrigation amount were set in Chifeng City，Inner Mongolia. Four tillage practices，rotary tillage straw mulching conventional sowing（XG），straw mulching no tillage sowing（MG），traditional tilling（CT）and subsoiling straw mulching（SS），and five irrigation levels，900，1 350，1 800，2 250 and 2 700 m³/hm² were set to determine wheat seedling rate，plant height，leaf area index，yield traits and grain yield. In addition，the interactions between the indexes were analyzed.【Results】With average seedling rate of 96.55%，MG had the highest seedling rate. Except for CT，under XG，MG and SS treatment，wheat plant height at maturity increased gradually with the increase of irrigation amount，with the maximum of 93.52，95.67 and 94.00 cm，respectively. The wheat leaf area index was affected by tillage practices，and was significantly（P<0.05）different under different irrigation amount. Under different tillage practices the five irrigation levels had different effect on the growth and development of wheat. The wheat yield under MG treatment was significantly higher than that of other treatments（P<0.05），and the maximum yield was 8 152.63 kg/hm² under irrigation amount of 2 700 m³/hm²，followed by the yield of 6 493.55 kg/hm² at irrigation amount of 2 250 m³/hm².【Conclusion】In Chifeng City，straw mulching no tillage sowing along with irrigation of 1 350-2 250 m³/hm² for wheat planting could achieve water conservation and productive yield improvement.

Key words: Wheat, Tillage practices, Irrigation amount, Growth index, Yield