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本实验应用~(15)N 稳定性同位素,研究了小麦各生育期氮的营养与干物质以及产量的关系。试验证明春小麦的干物质积累和氮的吸收趋势相一致。前期缓慢,从开花到灌浆期明显增加,以后逐渐降低。经二年的框栽和校内外田间试验指出,根据小麦氮营养的特点,按一般浅施种肥与追肥的方法,不能满足小麦后期氮营养的需要,深施10—12cm 尿素与浅施种肥相结合的方法可提高产量11.5—13.9%,并达到显著水平,可在我省大面积推广应用。
In this experiment, ~ (15) N stable isotopes were used to study the relationship between nitrogen nutrition and dry matter and yield in different growth stages of wheat. The experiment proves that the dry matter accumulation of spring wheat is consistent with the trend of nitrogen absorption. Pre-slow, from flowering to filling significantly increased, then gradually decreased. After two years of planting and field experiments both inside and outside the school, according to the characteristics of wheat nitrogen nutrition, according to the general method of shallow application of fertilizer and top dressing can not meet the needs of late nitrogen wheat nutrition, deep application of 10-12cm urea and shallow Fertilizer combination of methods to increase production 11.5-13.9%, and reached a significant level, can be widely applied in our province.