江苏沿海地区棉花磷肥适宜施用量探讨

Discussion of the Application Rate of Phosphate Fertilizer in Jiangsu Coastal Cotton Region

在江苏沿海棉区夹砂土,中等肥力施纯氮330 kg/hm2,氧化钾225 kg/hm2条件下,以创杂20为代表,通过设五氧化二磷的施用量为0、45.0、67.5、90.0、112.5、135.0 kg/hm26个处理,筛选苏沿海地区棉花施磷肥适宜用量,结果表明：施五氧化二磷67.5~90.0 kg/hm2是获得最高产量与最佳经济效益的磷肥适宜施用量。

The test took Chuangza 20 as representative variety,6 treatments were designed about the application of P2O5：0,47.5,67.5,90.0,112.5,135.0 kg/hm2 under conditions of sandy soil and medium fertility fields in Jiangsu coastal cotton region in order to select the suitable dosage of application.The results indicated that 67.5～90.0 kg/hm2 was the suitable P2O5 dosage for achieving the high yield and the best economic benefit.