摘要
晋南褐土区冬小麦钾肥不同用量试验结果表明：施用钾肥对小麦生长发育有明显影响，在氮磷配施增产的基础上再施用一定量钾肥增产效果显著．钾肥用量以７５ｋｇ／ｈａ表现最好，比ＣＫ增产５０．７％；比ＮＰ增产５．７％，每ｋｇＫ２Ｏ增产３．８２ｋｇ小麦，产投比１．５５．获得最高产量的理论施钾量为１３１．９５ｋｇ／ｈａ。依据边际理论求得经济合理施钾量为７５～９０ｋｇ（Ｋ２Ｏ）／ｈａ。
The experimental results of different rate of K fertilizer application to winter wheat showed that K fertilizer application and obvious effect on the growth and development of wheat,on the basis of N application combined with P, supplemented with some K fertilizers,the effect of increasing yield was significant. The optimum rate of K was 75 kg/ha, the yield was by 50. 7 K, 5. 7K, compared with control and N P application respectively. The yield of wheat could be increase by 3. 82 kg/1kg K2O application. The ratio of investigation and output was 1. 55. The theoritical K application rate for gaining maximum yield was 131. 95 kg/ha. According to the marginal theory, the economical K application rate was 75-90 kg (K2O) /ha.
关键词
褐土
冬小麦
钾肥
经济效益
Brown siol, Winter wheat, K fertilizer, Economic effect
