PREDICTION OF NITROGEN AVAILABILITY IN SOIL AFTER CROP RESIDUE INCORPORATION

被引：16

作者：

DAS, SK

REDDY, GS

SHARMA, KL

VITTAL, KPR

VENKATESWARLU, B

REDDY, MN

REDDY, YVR

机构：

[1] Central Research Institute for Dryland Agriculture, Hyderabad, 500 659, Saidabad P.O.

来源：

FERTILIZER RESEARCH | 1993年 / 34卷 / 03期

关键词：

CRITICAL C/N RATIO; CRITICAL-N CONCENTRATION; CROP RESIDUE; IMMOBILIZATION; INCUBATION PERIOD; MOISTURE REGIME; NITROGEN RELEASE;

D O I：

10.1007/BF00750566

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Controlled study was conducted with five farm-based organic residues to predict the expected nitrogen availability with time, based on N concentration and C/N ratio of the residues under two moisture availability situations. Two kg of red loamy sand soil representing Alfisol and related soil was incubated with the residues to supply 40 kg N ha-1 at 28 +/- 1-degrees-C at field capacity (FC) and 50% FC moisture conditions. Results obtained indicated that N content in soil released from residues increased with the time allowed for decomposition reactions at both FC and 50% FC moisture regimes. Relatively higher amount of N release was observed in case of legume residues like mungbean (Vigna radiata), L. leucocephala and perennial pigeonpea (Cajanus cajan), although the rate of N release was more with low N concentration residues. Sorghum stover with C/N ratio of 72.1 resulted in immobilization of N upto 90 days. Nitrogen release was higher at FC than 50% FC. The critical N concentrations of the residues at which N neither released nor immobilized decreased with the length of incubation. At 50% FC the critical concentrations were higher than at FC.

引用

页码：209 / 215

页数：7

共 22 条

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