干旱地区农业研究2016，Vol.34Issue(4)：175-182,8.DOI:10.7606/j.issn.1000-7601.2016.04.27
不同氮水平对旱地覆膜马铃薯干物质积累与分配的影响
Effects of nitrogen rates on dry matter accumulation and distribution of potato plants under film mulching in dry land
摘要
Abstract
Field experiment was carried out to evaluate the effect of nitrogen rates on growing stages and dry matter (DM ) accumulation of potato cv Longshu No .3 under film mulching in dry land .Six nitrogen rates ,0 (CK or T1 ) ,50 (T2) ,100 (T3) ,150 (T4) ,200 (T5) and 250 (T6) kg·hm-2 were used ,and field plots were arranged in a random-ized complete block design with four replications .The results showed that the application of nitrogen had significantly positive effect on the duration of growing stages of potato .Nitrogen applications obviously increased the duration of fast accumulation period (Δt ) for the whole plant and tubers ,being 2~14 days and 2~10 days ,respectively .Dynamics of dry matter accumulation in the whole plant and tuber both showed the “S”curve .The dry matter distribution of maturity potato responded differently to nitrogen .With the increase of nitrogen rates ,dry matter distribution ratio obviously in-creased in both stem and leaf ,while those of tuber increased first then decreased ,exhibiting a single peak curve .Com-pared with T1 ,T2 treatment increased the tuber yield by 17 .86% ,while those of T3 ,T4 ,T5 and T6 treatments were decreased by 6 .88% ,21 .06% ,27 .05% and 38 .63% ,respectively .The depressing effect of N on potato yield may be partly due to the disturbance in sink-source relationship of potato plants ,and it is suggested that 50 kg·hm-2 N be the economic rate of N fertilizer in this area .关键词
氮水平/马铃薯/旱地覆膜/干物质积累与分配/源库协调Key words
nitrogen level/potato/film mulching in dry land/dry matter accumulation and distribution/source-sink relationship分类
农业科技引用本文复制引用
何万春,何昌福,邱慧珍,张文明,王亚飞,张春红,王蒂..不同氮水平对旱地覆膜马铃薯干物质积累与分配的影响[J].干旱地区农业研究,2016,34(4):175-182,8.基金项目
国家科技支撑计划项目（2012BAD06B03）；国家公益性行业（农业）科研专项（201103004）；国家现代农业产业技术体系建设专项（CARS －10－P18）；甘肃省科技重大专项 （）
