Influence of Nitrogen Levels and Application Methods on Yield and Quality of Sorghum

A.RASHID; R.U.KHAN; H.ULLAH

摘要

A field study was conducted for two years at the Arid Zone Research Institute,Dera Ismail Khan,Pakistan,to determine the optimum level of nitrogen and efficient application method in the production of sorghum (Sorghum bicolor L.).Using four levels of nitrogen,i.e.,O,60,90,and 120 kg ha-1,and two different application methods (soil application and foliar spray),the experiment was laid out in a split-plot design,where the main plots were used to determine the effective method of application and the subplots were used to detect the influence of N levels on the grain yield.The average data obtained after two years of study indicated an increase in the grain yields with an increase in N levels irrespective of the method used of N application.The grain yield increased from 2.92 to 5.61 t ha-1 in the plots that were treated with 90 kg N ha-1 compared with the control plots.Quadratic regression analysis showed that the increase in the yield was higher at the lower levels of N compared with the succeeding higher levels.The soil application method,producing an average grain yield of 4.79 t ha-1,was found to be superior to the foliar spray method with an average grain yield of 4.56 t ha-1.The protein content of the grain showed a linear increase with N application,attaining the maximum at 120 kg N ha-1 in both the methods of N application.In addition,compared with the method of soil application,higher crude protein contents were observed using the method of foliar spray at all N levels.

机译：在巴基斯坦德拉伊斯梅尔汗（Dera Ismail Khan）干旱地区研究所进行了为期两年的实地研究，以确定高粱生产中的最佳氮含量和有效施用方法。使用四种氮含量，分别是O，60、90和120 kg ha-1，以及两种不同的施用方法（土壤施用和叶面喷雾），该实验采用分块设计进行设计，其中主要的块用于确定有效的施用方法和亚图法用于检测氮水平对谷物产量的影响。两年研究后获得的平均数据表明，与施用氮肥方法无关，谷物产量随氮水平的增加而增加。与对照相比，用90 kg N ha-1处理的地块的谷物产量从2.92 t ha-1增加到5.61 t ha-1。二次回归分析表明，在较低的氮水平下，产量的增加更高与结果表明，土壤施用方法的平均谷粒产量为4.79 t ha-1，优于叶面喷施方法，平均谷粒产量为4.56 t ha-1。氮肥施用量均呈线性增加，两种氮肥施用量均达到最大120 kg N ha-1。此外，与土壤施用方法相比，叶面喷施方法观察到的粗蛋白含量更高N级。

Influence of Nitrogen Levels and Application Methods on Yield and Quality of Sorghum

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