施钾肥对红薯的肥效试验及经济效益分析

Fertilizer Effect Trial and Economic Benefits Analysis of Applying Potassium Fertilizer on Sweet Potato

确定钾肥对红薯的肥效及适宜用量。于2005~2006年在秦都区马庄镇押小村进行了钾肥对红薯的肥效试验。试验设6个处理,分别施硫酸钾75、1502、253、003、75、450 kg/hm^2,不施钾肥为CK。所有肥料在春季整地作垄时作基肥一次性施入垄内,栽植密度为7.20万株/hm^2。和对照相比,施钾肥处理增产2 984.10~6 973.35 kg/hm^2,增产率达9.84%~22.98%。在施尿素165 kg/hm^2、过磷酸钙750kg/hm^2、有机肥22 500 kg/hm^2的条件下,施硫酸钾肥料217.50 kg/hm^2,红薯最高产量为36 435.30 kg/hm^2,产投比为12.99∶1;施硫酸钾肥料258.0 kg/hm^2,红薯最高产量为36 417.6 kg/hm^2,产投比为13.13∶1,经济效益最佳。红薯施用硫酸钾肥料有显著的增产效果,红薯的硫酸钾肥料最佳施用量为258.0 kg/hm^2。

The study aimed to ascertain the fertilizer effect of potassium fertilizer on sweet potato and its suitable dosage.In the fertilizer effect trial of potassium fertilizer on sweet potato in Yaxiao village,Mazhuang town,Qindu district in 2005～2006,6 treatments of applying 75,150,225,300,375 and 450 kg/hm2 potassium sulfate were set up,with applying no potassium fertilizer as CK.All the fertilizers as base fertilizers were applied for once in ridges in soil preparation and ridging in spring and the planting density was 7.20×104 plants/hm2.Compared with CK,the treatments applying potassium fertilizer increased 2 984.10～6 973.35 kg/hm2,increasing by 9.84%～22.98%.Under the condition of applying 165 kg/hm2 urea,750 kg/hm2 calcium superphosphate and 22 500 kg/hm2 organic fertilizer,the highest yield and the ratio of output to input of sweet potato applied with potassium sulfate fertilizer 217.50 kg/hm2 were 36 435.30 kg/hm2 and 12.99∶1 and that of sweet potato applied with potassium sulfate fertilizer 258.0 kg/hm2 were 36 417.6 kg/hm2 and 13.13∶1,whose economic benefit was best.Potassium sulfate fertilizer had significant increase effect on sweet potato and the optimum application amount of potassium sulfate fertilizer was 258.0 kg/hm^2.