砂薄地夏玉米施钾效应研究

研究了砂薄地玉米施钾效应，田间试验结果表明：砂薄地玉米产量随施钾量的增加而增加，且以施钾量225kg/hm2为最佳，此时钾肥产投比最高，达5.2，能取得较高的产量和获得较高的钾肥利用率；施钾能够提高砂薄地玉米籽粒蛋白质含量，但与施钾的产量效应变化趋势不同，在施钾225kg/hm2时蛋白质含量最高，继续提高施钾量则蛋白质含量呈现下降趋势。土壤速效钾含量随施钾量的增加而增加，欲保持玉米生长周期结束后土壤钾素肥力平衡，施钾量应达到150kg/hm2。玉米籽粒产量与生育期内玉米体内钾素含量呈显著正相关，其中拔节期、喇叭口期、抽雄期和成熟期的植株钾含量与产量之间相关系数分别达0.87、0.95、0.94、0.99。

Effect of Potassium Fertilizer Application on Maize in Sandy Soil

Field plot test was used to studied the effect of potassium fertilizer application on maize in sandy soil, the result showed that the maize yield was increased in sandy soil as the applying rate of potassium fertilizer was increased ，the optimal rate of potassium fertilizer was 225 kg K2O/hm2 at which the highest ratio of import to export with relative higher seed yield and potassium utilization efficiency can be got. Applying potassium fertilizer can improve the seed protein content too, but differing from the yield response to the applying rate of potassium fertilizer, the seed protein content reached highest point at the rate of 225kg K2O/hm2,then decreased as applying more rate of potassium fertilizer. Applying potassium fertilizer increased the soil available potassium content, for keep the balance of soil potassium fertility after the maize growth cycle, the applying rate of potassium fertilizer should reached 150kg K2O/hm2 . the maize seed yield showed significant positive correlation with the plant potassium content the coefficient was 0.87、0.95、0.94、0.99 at jointing stage, booting stage and heading stage respectively.