广西马铃薯稻草覆盖免耕栽培种植密度和施肥量比较试验

Comparison of Planting Density and Fertilization Amount of Potato Covered with Straw under No-tillage System in Guangxi

为了探讨广西马铃薯稻草覆盖免耕栽培适宜的种植密度和施肥量,采用二因素随机区组设计,设置了4种种植密度(7.50万株/hm2、8.25万株/hm2、9.00万株/hm2和9.75万株/hm2)及4个施肥量〔施N量分别为75.00 kg/hm2、150.00 kg/hm2、225.00 kg/hm2和300.00 kg/hm2,m(N)∶m(P2O5)∶m(K2O)=2∶1∶4〕共16个处理,研究了不同种植密度和施肥量对马铃薯稻草覆盖免耕栽培产量及质量的影响。结果表明:种植密度为8.25万株/hm2,施肥量为N225.00 kg/hm2、P2O5112.50 kg/hm2、K2O450.00 kg/hm2时,单穴大中薯重量最大,且产量和扣除种薯、肥料费用后的净收入也是最高,分别达到了28997.62 kg/hm2和68990.96元/hm2。

The effects of planting density and fertilization amount on the yield and quality of potato covered with straw under no-tillage system in Guangxi were stuied using random block design of two factors.The results showed that when the planting density was 82 500 plants/hm2,and the fertilization amount of N 225.00 kg/hm2,P2O5 112.50 kg/hm2 and K2O 450.00 kg/hm2,respectively,the weight of big-sized and medium-sized potato in single point was the highest,and the yield（28 997.62 kg/hm2）and net income（68 990.96 yuan/hm2）were the highest.