扦插密度和氮、磷、钾对紫甘薯产量的影响

Effects of Cutting Density and N,P,K on Purple Sweet Potato Yield

采用单因素随机区组设计和"3414"最优回归设计,分别研究紫甘薯在不同扦插密度和氮、磷、钾水平配比时的产量效应,并建立扦插密度和氮、磷、钾施用量与紫甘薯产量关系的肥料效应函数模型,以确定台州市紫甘薯的最适扦插密度和最佳施肥量。结果表明,紫甘薯在扦插密度为3.97万株·hm^(-2)时,产量最高为24.19 t·hm^(-2);在沙土上紫甘薯每公顷最佳经济效益施肥量为N 155.12 kg,P_2O537.57 kg,K_2O 160.79 kg,N∶P_2O_5∶K_2O为1∶0.24∶1.03。

By used both single factor randomized block design and ＂3414＂optimum regression design, effects of cutting density, N, P and K on purple sweetpotato yield were studied, and the function model was built to learn about the optimum cutting density and fertilizer application rate. The results indicated that the maximum yield reached 24.19 t·hm-2 with cutting density of 3.97 × 104 plants·hm-2. The fertilizer rate applied in sand soil with optimum economic benefit was N, P2O5 and K2O of 155.12, 37.57, 160.79 kg. hm-2 （N：P2O5 ：K2O ratios of 1：0.24：1.03） respectively.