鄂尔多斯北部沿河灌区西瓜施肥合理施用量研究

Reasonable Fertilizer Application Rates of Watermelons along the Irrigation Area of Northern Ordos and Recommendations

试验研究了不同水平尿素、相同水平尿素不同磷酸二铵含量对西瓜增产效果及其肥分利用率。结果表明:不同施氮肥、配比氮肥与磷肥均可提高西瓜产量。在每hm2施150-300kg尿素的范围内,施尿素300kg肥效较好,增产效果明显。在施用尿素150kg/hm2条件下,磷酸二铵不同用量里以施450kg时每kg增产最高。混合施用尿素、磷酸二铵高产田及中产田肥料效益方程分别为Y=46405+53.918x-0.0667x2和Y=30618+21.943x+0.0118x2。单施尿素150 kg/hm2、300kg/hm2时肥分利用率为18.4%、28.6%;磷酸二铵中的磷肥利用率在150-450kg/hm2范围时肥料利用率19.6%-29.0%,高产田在施600kg/hm2时肥料利用率10.2%,肥料利用率降低。

To study the impact of different levels of urea or diammoninm phosphate on watermelons yield and its fertilizer utilization rate. The results showed it improved the yield of watermelons by different levels of urea. Combined application of urea and diammonium phosphate fertilizer also improved the yield of watermelons. Within the range of 150-300kg urea per hectare, application 300kg/hm2 urea significantly improved yield. When 150kg/hm2 urea applied, there was the highest yield of watermelons with 450kg/hm2 diammonium phosphate applied;the benefit equation of using mixed Carbamide and Diammonium phosphate as fertilizer in high and middle yield field was Y=46405＋53.918x-0.0667x2 and Y=30618＋21.943x＋0.0118x2. The nitrogen fertilizer utilization rate was 18.4% and 28.6% by Single application of urea 150kg/hm2 and 300kg/hm2, respectively. The diammonium phosphate fertilizer utilization rate was 19.6%-29.0% in the range of 150-450kg per hectare. High yield field fertilizer utilization rate was 10.2% in the range of 600kg per hectare.