追施尿素对高粱干物质积累及产量的影响

doi:10.12190/j.issn.2096-1197.2021.01.09

Abstract

Abstract: 【Objective】 To clarify the effect of topdressing urea on dry matter accumulation and yield of sorghum. 【Methods】 Tongzao No.2 and Tongza 139 as the experimental materials,with randomized block design and three gradients：0（N0）,112.5 kg/hm²（N1） and 225.0 kg/hm²（N2） to analyze the effects of topdressing urea by different dosage on dry matter accumulation,proportion of dry matter in each organ,conversion rate of source production capacity after flowering,and yield of sorghum.【Results】 The growth period of sorghum treated with topdressing urea was longer than that without topdressing urea. When 225.0 kg/hm² urea using,the dry matter accumulation of Tongzao No.2 reached highest,dry matter accumulation reached 19 141.78 kg/hm² until the maturity stage,dry matter ratio of ear was the highest（56.96%） at the maturity stage,and conversion rate of source production capacity after flowering was the highest（85.32%）,and grain yield reached 5 101.48 kg/hm². When 112.5 kg/hm² urea using,the dry matter accumulation of Tongza 139 reached highest,dry matter accumulation reached 23 369.33 kg/hm² until the maturity stage,dry matter ratio of ear was the highest（55.61%） at the maturity stage,and conversion rate of source production capacity after flowering was the highest（89.87%）,and grain yield reached 7 788.21 kg/hm².【Conclusion】 When topdressing urea amounts of 225.0 kg/hm² for Tongzao No.2 and 112.5 kg/hm² for Tongza 139,which could effectively increased the dry matter accumulation of sorghum and improved the conversion rate of source production capacity after flowering and increased the yield.

Key words: Sorghum, Urea, Dry matter accumulation, Source-sink relationship, Yield

CLC Number:

S514

XU Qingquan, CUI Fengjuan. Effects of topdressing urea on dry matter accumulation and yield of sorghum[J].Journal of Northern Agriculture, 2021, 49(1): 60-64.

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URL: https://journal30.magtechjournal.com/bfnyxb/EN/10.12190/j.issn.2096-1197.2021.01.09

https://journal30.magtechjournal.com/bfnyxb/EN/Y2021/V49/I1/60

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Effects of topdressing urea on dry matter accumulation and yield of sorghum

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