盐碱荒地覆膜滴灌施氮量对甜菜产质量的影响

Effect of sugarbeet yield and quality with nitrogen fertilizer plastic film covered and drip irrigation in saline－alkali and uncultivated soil

本文对盐碱荒地滴灌条件下，N肥的施用量与甜菜产质量关系进行了探讨。结果表明：在0～240kg／hm2施N范围内，块根产量随施N量增加而提高，且呈线性正相关（r＝0．9921）；每公斤N增加块根产量比常规灌高，说明滴灌利于N肥吸收。随施N量增加，块根含糖率下降。当施N超过150kg／hm2后，N肥对糖分的影响作用随施N量的增加，含糖率明显下降。无论是青头还是根体，含糖率均较常规灌高。施N 240kg／hm2产糖量最高，说明此施氮量不是施氮极限。

：The relation of nitrogen fertilizer applied sugar beet yield and quality was studied in saline－alkali and uncultivated soil plastic film covered and drip irrigation the results indicated that sugarbeet yield increase by nitrogen fertilizer applied from 0～240 kg／ha it is liner positive correlationr＝0．9921 also the sugar yield is higher than old routine irrigation by one kg nitrogen fertilizer applied and it showed that the drip irrigation took advantage of the absorption of nitrogen fertilizer but the sugar content in root was decreased by nitrogen fertilizer more applied when over 150kg／ha． the effect to sugar content with more nitrogen applied sugar content decreased clearly． The sugar yield is the highest of N 240kg／ha applied．