几种钾肥对水稻产量、品质及土壤养分的影响

Effects of Several Types of K Fertilizers on Rice Yield,Quality and Soil Nutrient Status in Paddy Soil of Hubei Province

为探讨不同钾肥对水稻生产和水稻土壤肥力的影响,在湖北省沙洋县水稻土上施入等量K2O进行试验,测定了K2SO4、KCl和硫酸钾镁施用对水稻土壤肥力、水稻产量及养分吸收的影响。结果表明,硫酸钾镁处理的产量最高,K2SO4处理的稻米品质最好;K2SO4和硫酸钾镁处理降低了水稻全磷、全钾含量,提高了土壤有效磷、速效钾含量,促进植株吸收N并降低土壤碱解氮含量,而KCl作用相反;K2SO4、KCl处理的植株Ca、Mg、P含量较少,而硫酸钾镁处理的较高。

To investigate the effect of different varieties of K fertilizer application on rice production and soil fertility, the field plot experiments were carried out in Shayang county, Hubei province.The effects of K2SO4 and KCl to soil fertility and rice nutrient uptake, as well as the common use of K2 （Mg）SO4 on rice production were examined.The results showed that the K, Mg accumulation in rice straw and yield were significantly correlated.K2 （Mg）SO4 treatment had the highest production, but K2SO4 treatment had the best quality for rice.K2 （Mg）SO4 and K2SO4 application could reduce the content of P, K in rice, increase soil available P, K content and decrease N supply capacity.Meanwhile, these K fertilizers would help rice to take up N, but KCl application was on the contrary.The contents of Ca, Mg, P in plant by treating of K2SO4, KCl were less than those by K2（Mg）SO4 treatment.