密植石榴追肥中速效性氮素分配比例的研究

目的]为密植石榴生产速效性氮肥的施用提供理论依据。方法]采用Scheffe提出的单形重心设计,对石榴生产过程中花前追肥、花后追肥和果实膨大期追肥中速效性氮素的投放比例进行研究。结果]在每株施用纯氮180 g的条件下,建立了石榴单株产量与3次速效性氮素施用比例之间的数学模型。结论]通过计算机寻优,获得最高单株产量10.66 kg时,3次施氮比例为0.4∶0.3∶0.3;产量9.5 kg/株以上的72套方案中,其优化配比为0.390∶0.319∶0.291。

Studies on the Ratio of Available Nitrogen Application in Close Planting of the Pomegranate

Objective] The aim of the study was to provide basis for application of rapidly available nitrogen in close planting of the pomegranate.Method] Using designs of simplex centre by H.Scheffe,embarking proportion of available nitrogen were studied in before blooming,after blooming and fruit enlargement period.Result] The mathematical model was established between pomegranate yield per plant and the ratio of nitrogen application 3 times in before blooming,after blooming and fruit enlargement period under topdressing pure nitrogen 180 g per plant.Conclusion] Through Computer optimization,the best ratio of the first,the second and the third application of nitrogen fertilizer to pomegranate was 0.4∶0.3∶0.3,the maximum output was 10.66 kg per plant.The schemes of the ouput over 9.5 kg per plant were 72 sets,and the optimal ratio was 0.390∶0.319∶0.291.