栽培因素对丘陵旱地小麦产量的影响

Effect of Cultivation Factors on Grain Yield of Spring Wheat in Hilly Dry Land

1997年和1998年，在丘陵旱地进行栽培因素对小麦产量影响的试验，结果表明：①干旱对旱地小麦有着极为显著的影响，干旱年处理平均产量比丰水年下降了28．1％，但减产幅度在品种之间又存在显著差异，即强春性早熟种和弱春性晚熟种减幅较大，春性中熟种相对较小；②播期是影响产量的重要因素之一，根据品种类型抓准最佳播期则能起到明显的抗旱增产作用；③丰水年增施氮素多数处理有显著的增产效果，而干旱年，增氮多数处理无增产作用。密度对产量的影响不大，品种和施氮水平不同，其效应有一定差别。

Experiments were conducted in 1997 and 1998 to test the effect of cultivation factors on the grain yield of spring wheat in hilly dry land of Sichuan. The results showed that: ①Drought had significant effect on the grain yield and the average yield in the dry year of 1998 dropped by 28.1 % compared with the rainy year of 1997. However, there was difference in drought resistance among varietics; ②Sowing date was one of the most important factors affecting grain yield of wheat in hilly dry land and the optimum of sowing date, according to varities, was effective to raise per unit yield and drought resistance of wheat; ③In rainy years, the application of N had great effect on the increase of the yield per unit. While in dry years, the application of N could not help increase the yield. The mass density had little effect on the yield; varieties and the amount of the applied N had different effect.