甘薯高产施肥技术的研究

采用三因素二次正交旋转组合回归设计试验，对甘薯氮、磷、钾施肥量进行了研究。通过１９９４，１９９５两年的田间试验，建立了甘薯施肥的产量反应数学模型。结果表明：对产量的影响顺序是钾＞氮＞磷，最佳组合是Ｎ７．５４～９．２４ｋｇ／亩，Ｐ２Ｏ５７．７５～８．５７ｋｇ／亩，Ｋ２Ｏ２４．５４～２９．０６ｋｇ／亩，亩产可达３０００ｋｇ左右。

Fertilizer Application Technique for High Yield of Sweet Potatoes

In this paper, the experimental design was regression of 3 factors quadric orthogonal revolving combination. The rate of N,P,K fertilizer application to sweet potatoes was studied,and the mathematical model of yield reaction to the rate of fertilizer application was established by the paramenters tested in the field experiment during 1994￣1995,The result showed that the effect sequence of N,P,K on the Yield of sweet potatoes was as follows: K>N>P. The optimum combination was N7. 54￣9. 2kg/mu, P2O57. 75￣8. 57kg/mu and K2O 24. 5￣29. 06kg/mu. In this way, Yield of sweet potatoes 2 950kg/mu or so could be obtained.