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对浙江省金华市郊区石门农场灌溉稻区进行连续4年定位钾肥试验,结果表明,钾素促进氮磷养分向水稻穗部的输入,故在增产的基础上,同不施钾处理比较,施钾后杂交稻氮的总吸收量增加7.1～9.3kg/hm2,利用效率提高3.7～7.1%;磷的总吸收量增加1.0～2.0kg/hm2,利用效率提高2.0～7.7%。同常规稻比较,每季杂交稻氮和磷的平均总吸收量分别高出7.6kg/hm2和1.2kg/hm2;氮和磷的利用效率平均高出3.1kg/kg和34.7kg/kg;在养分的吸收、积累以及利用效率方面表现出明显的生理优势[1]。因此,在杂交水稻的生产实践中,应相对增加钾肥的施入量,从而提高氮肥和磷肥的利用效率。
Four years of potash fertilizer experiment were conducted in Shimen Farm Irrigated Rice Area of Jinhua City, Zhejiang Province. The results showed that potassium promoted the input of nitrogen and phosphorus nutrients to rice ears. Therefore, on the basis of yield increase, compared with no potassium application, The total nitrogen uptake by potassium increased by 7.1 ~ 9.3kg / hm2, the utilization efficiency increased by 3.7 ~ 7.1%, the total phosphorus uptake increased by 1.0 ~ 2.0kg / hm2, and the utilization efficiency increased by 2.0 ~ 7.7%. Compared with conventional rice, the average total N and P uptake of hybrid rice per season was 7.6 kg / hm2 and 1.2 kg / hm2, respectively; the average nitrogen and phosphorus use efficiency was 3.1 kg / kg and 34.7 kg / kg, respectively; Nutrient absorption, accumulation and utilization efficiency showed obvious physiological advantages [1]. Therefore, in the practice of hybrid rice production, the amount of potash fertilizer should be relatively increased to improve the efficiency of nitrogen and phosphate fertilizer use.