早收情况下甘薯新品种心香栽培技术研究

Experiments on the Cutting Density and Fertilization Technology of the New Sweet Potato Variety Xinxiang under Early Harvest

[目的]探索主要栽培技术对甘薯品种心香早收产量和效益的影响。[方法]采用单形格子设计,布置田间参数试验,分别建立扦插密度、尿素和硫酸钾用量与心香早收鲜薯产量和净产值的回归数学模型,并对模型进行解析。[结果]由模型求出,扦插密度40 575～44 625株/hm2,尿素245.25～306.75 kg/hm2,硫酸钾234.45～305.55 kg/hm2时,心香鲜薯产量在27 000 kg/hm2以上;扦插密度41 295～45 225株/hm2,尿素256.20～317.40 kg/hm2,硫酸钾203.55～276.45 kg/hm2时,心香净产值在13 500元/hm2以上。产量与效益的联合分析表明甘薯心香提高产量与提高效益所采取的栽培措施是一致的。[结论]结合生产实际综合考虑,在该试验条件下,扦插密度45 000株/hm2左右,尿素270～300 kg/hm2,硫酸钾225～300 kg/hm2,心香的产量和净产值均较高。

[Objective] The purpose of the study was to explore the influences of main cultivation technologies on the yield and benefit of sweet potato variety Xinxiang harvested early. [Method] The field parameter experiment with simplex lattice design was arranged to establish the regression mathematic models between the cutting density, urea dosage, potassium sulfate dosage and the fresh potato yield of Xinxiang harvested early and its net yield value resp., and the model was analyzed. [Result] It was obtained from the model that when the cutting density was in 40 575～44 625 plants/hm^2 and the dosages of urea and potassium sulfate were in 245.25～306.75 and 234.45～305.55 kg/hm^2, the fresh potato yield of Xinxiang was over 27 000 kg/hm^2; when the cutting density was in 41 295～45 225 plants/hm^2 and the dosages of urea and potassium sulfate were in .256.20～317.40 and 203.55～276.45 kg/hm^2, the net yield value of Xinxiang was over 13 500 yuan/hm^2. The combination analysis on yield and benefit showed that the used cultivation measures for enhancing the yield and benefit of sweet potato Xinxiang were accordant. [Conclusion] Considering production practice comprehensively, under this experimental condition, when the cutting density was about 45 000 plants/hm^2 and the dosages of urea and potassium sulfate were in 270～300 and 225～300 kg/hm^2, both yield and net yield value of Xinxiang were hie.her.