Effect of Different Irrigation Rates on Agronomic Traits and Yield of Soybean at Seed Filling Stage
Drought was one of the most important agrometeorological disasters in Hulunbuir City.In order to clarify the response mechanism of soybean to drought,pot water control experiment was used to study the effects of different irrigation amounts on soybean agronomic traits and yield.The results indicated that as the amount of irrigation decreases and the degree of soil drought intensifies,it would inhibit the maturity time of soybeans.The control group(CK)had the highest plant height of 85.2 cm;The stem diameter of control group(CK)was 7.6 mm,which was significantly different from that of moderate drought(S55％)and severe drought(S45％),indicated that excessive soil water was easy to cause plant growth,and moderate adjustment of irrigation was conducive to the coarse growth of soybean stem.The number of pods per plant under different irrigation treatments showed as follows:control group(CK)＞mild drought(S65％)＞moderate drought(S55％)＞severe drought(S45％).The grain weight per plant showed as mild drought(S65％)＞control group(CK)＞moderate drought(S55％)＞severe drought(S45％).The 100-grain weight showed as mild drought(S65％)＞control group(CK)＞moderate drought(S55％)＞severe drought(S45％).Although the control group(CK)had the highest number of pods per plant,its empty pod rate was high,resulting in the highest grain weight per plant and 100-grain weight under mild drought(Se％).This indicated that in agricultural production,mild drought(S65％)is beneficial for soybean yield.
Different irrigationSoybeanAgronomic characterYield
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