对6个三系、两系杂交中籼稻组合进行6水平的施氮量处理,结果表明:同等肥力水平下,两系组合植株矮,每穗总粒数多,单位面积总颖花量大;随着氮素水平的提高,2类组合主要农艺性状均发生变化,总体上两系组合产量高、耐肥、产量潜力大,要充分发挥其产量潜力,须投入更多的氮素;三系组合更适合在中、低肥力水平田块种植,适当增施氮素均有利于增产。 The results showed that under the same fertility level, the two - line combination plants were short, with more total grains per panicle and larger total spikelet per unit area. With the increase of nitrogen level, the main agronomic traits of the two kinds of combinations all changed. Generally speaking, the yield of two lines was high, and the potential of yield was high. To put the yield potential into full play, more nitrogen should be put into. Combination is more suitable for medium and low levels of fertility field plots, appropriate nitrogen addition is conducive to increasing yield.