采用田间试验方法，研究了钾对大豆产量、产量构成因素及品质的影响。
The effect of potassium on the yield and quality was studied in the field.
其次，小麦和水稻的产量增长一直低于玉米和大豆。
Second, yield growth has been lower in wheat and rice than in corn and soyabeans.
其次，小麦和水稻的产量增长一直低于玉米和大豆。
Second, yield growth has been lower in wheat and rice than in corn and soyabeans.
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