Physical properties of an Oxisol and crops yield under succession and rotation

被引:24
作者
Genro Junior, Silvio Aymone [2 ]
Reinert, Dalvan Jose [1 ]
Reichert, Jose Miguel [1 ]
Albuquerque, Jackson Adriano [3 ]
机构
[1] Univ Fed Santa Maria, CCR, Dept Solos, BR-97105900 Santa Maria, RS, Brazil
[2] Convenio Inst Riograndense Arro Cooperat Agr Aleg, Estacao Expt Arroz, Cachoeirinha, RS, Brazil
[3] Univ Estado Santa Catarina, Ctr Ciencias Agrovet, Dept Solos, Florianopolis, SC, Brazil
来源
CIENCIA RURAL | 2009年 / 39卷 / 01期
关键词
soil structure; compaction; water retention curve; CROPPING SYSTEMS; SOIL-MANAGEMENT; ORGANIC-CARBON; NO-TILLAGE; COMPACTION; ATTRIBUTES;
D O I
10.1590/S0103-84782009000100011
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
This study had as objective to evaluate the effects of Crops succession and rotation on physical properties and crops Yield on an Oxisol (clayey Haplortox) under no-tillage system, in Rio Grande do Sul State, Brazil. The treatments included four cropping sequences, used from 1998 to 2001: 1) succession wheat / soybean, 2) rotation corn / oat / corn+ Cajanus cajan L. Millsp / wheat / soybean / wheat, 3) rotation Cajanus cajan L. Millsp / whew / soybean) / wheat / soybean / oat, and 4) rotation Crotalaria juncea L. / wheat soybean / oat / corn / wheat. In October of 2000 and 2001, Soil samples were collected to determine physical properties. In all Years. the crops yield was measured. The Oxisol cultivated under no-tillage had it high compaction degree, with soil bulk density greater and macroporosity smaller than the critical limit for clay texture. The largest limitations were observed below the layer of 0 to 0,03m, because tit the uppermost layer soil mobilization by successive operations of fertilization and sowing increases soil porosity and reduces soil density. Thus. greater volume of pores is observed between soil saturation and field capacity. responsible for soil aeration, and between field capacity and wilting point, responsible for storage of plant available water The use of cover crops once every three Years was not efficient to reduce soil compaction. The Yield of the subsequent crops was influenced positively tit the rotation with Crotalaria juncea, while the other cropping systems did not differ from crop succession.
引用
收藏
页码:65 / 73
页数:9
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