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试验采用盆栽方式,设置氮肥和秸秆还田2个因素,10次重复,4个施氮水平(N0、N1、N2、N3),施纯氮量分别为0、75、150、300 kg hm-2。试验结果表明,随着氮肥的施用量增加,无论有无秸秆添加,玉米光合碳量均呈现升高的趋势;在秸秆还田条件下,施氮量为300 kg hm-2时,光合碳量最大、产量最高;N0光合碳量对籽粒贡献率最大,JN1光合碳量对籽粒贡献率最小。对于玉米器官碳运转总量来说,JN2处理最大;随着施氮水平的继续提高,碳水化合物的转运相对减少,JN0的器官碳运转总量最小。当施氮量达到N2、N3水平时,无秸秆添加处理的玉米穗重分别为134.3 g、167.5 g,低于秸秆添加处理的154.5 g和176.7 g。玉米百粒重变化与穗重变化呈现出相似趋势。
The pot experiment was conducted in this experiment. Two factors including nitrogen fertilizer and straw returning to field were set up, 10 repeated and 4 nitrogen application levels (N0, N1, N2, N3). The nitrogen application rates were 0,75,150,300 kg hm- 2. The results showed that the photosynthetic carbon content of maize showed an increasing trend with or without straw addition with the increasing of nitrogen application rate. Under the condition of straw returning to the field, with the nitrogen application rate of 300 kg hm-2, the photosynthetic carbon content The highest and the highest yield. N0 photosynthetic carbon content contributed the most to grain, JN1 photosynthetic carbon content contributed the least to grain. JN2 treatment was the largest for the total carbon operation of corn. With the continuous increase of N application, the transport of carbohydrate was relatively reduced, and the total amount of organ carbon was the lowest in JN0. When the amount of nitrogen fertilizer reached N2 and N3 levels, the ear weight of maize without straw addition was 134.3 g and 167.5 g, respectively, which was lower than 154.5 and 176.7 g of straw addition. The change of 100-grain weight and panicle weight showed a similar trend.