NITROGEN MINERALIZATION, NITRATE LEACHING AND CROP GROWTH FOLLOWING CULTIVATION OF A TEMPORARY LEGUMINOUS PASTURE IN AUTUMN AND WINTER

被引：71

作者：

FRANCIS, GS

HAYNES, RJ

SPARLING, GP

ROSS, DJ

WILLIAMS, PH

机构：

[1] MAF Technology, Lincoln, Canterbury

[2] DSIR Land Resources, Lower Hutt, Private Bag

来源：

FERTILIZER RESEARCH | 1992年 / 33卷 / 01期

关键词：

CULTIVATION; LEACHING; MINERALIZATION; MIXED CROPPING; NITRATE; NITROGEN; PASTURE;

D O I：

10.1007/BF01058010

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

A field experiment was conducted to investigate the effect of timing and method of cultivation of a 3-year old ryegrass/white clover pasture on subsequent N mineralization, NO3--N leaching, and growth and N uptake of a wheat crop in the following season. The size of various N pools and decomposition of C-14-labelled ryegrass material were also investigated. Cultivation method (mouldboard of chisel ploughing) generally had no significant effect on the accumulation of mineral N in the profile in the autumn or on the amount of NO3--N leached over winter. C-14 measurements suggested that initial decomposition rate of plant material was faster from May than March cultivation treatments. Despite this, overall net mineralization of organic N (of soil plus plant origin) increased with increasing fallow period between cultivation and leaching. The total amounts of mineral N accumulated in the soil profile before the start of leaching were 139, 119 and 22 kg N ha-1 for the March, May and July cultivated soils respectively. Cumulative leaching losses over the trial calculated from soil solution samples were 78, 40 and 5 kg N ha-1 for the March, May and July cultivated soils respectively. Differences in N mineralization over the season were generally not reflected by changes in amounts of potentially-mineralizable soil N (as measured by extraction or laboratory incubation) or levels of microbial biomass during the season. The amount of mineral N in the profile in spring increased with decreasing fallow period. This was reflected in an approximately 15% and 25% greater grain yield and N uptake respectively by the following wheat crop in plots cultivated in July rather than in March.

引用

页码：59 / 70

页数：12

共 27 条

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