Effects of Long Term Cropping Systems on Soil Chemical Properties Report as inadecuate




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In this study we examined the impact on soil C, total soil N and available P of six rotations namely: long season tobacco cultivar ‘KM10’ grown continuously (ContKM10), medium season tobacco cultivar ‘RK8’ grown continuously (ContRK8), grass-grass-grass-KM10 (G-G-G-KM10), grass-grass-grass-RK8 (G-G-G-RK8), KM10-Crotalaria juncea (KM10-Cr) and RK8-Crotalaria juncea (RK8-Cr). The experiment was established in 1990 under irrigation on a sandy loam soil at Kutsaga Research Station, Zimbabwe. Soil samples were taken from 0- to 15-cm deep, after each season. After 9 years, tobacco-grass rotations showed higher soil C than monocropping, regardless of variety. The monocropping systems, ContKM10 and ContRK8, did not differ from KM10-Cr and RK8-Cr respectively showing that when crop intensity is maintained soil C will be reduced regardless of a winter C. juncea green manure in a sandy loam soil. After 9 years, soil N was greatest in the G-G-G-KM10 rotation. Available P was lower in the grass (G-G-G-KM10, G-G-G-RK8) relative to the other rotations regardless of variety. Available P accumulated in monocropping systems (ContRK8, ContKM10) and was consistently lower in the grass-tobacco rotations. This indicated an accumulation of P in the case of monocropping systems because of continuous inorganic fertiliser input. The results reaffirmed the deleterious effect of monocropping and suggested the need for diverse rotations.

Keywords: Crotalaria ; soil carbon ; nitrogen ; phosphorous ; rotations ; grass

Subject(s): Demand and Price Analysis

Food Consumption/Nutrition/Food Safety

Issue Date: 2012-12

Publication Type: Journal Article

DOI and Other Identifiers: ISSN(P): 2304-1455 (Other)

ISSN(E): 2224-4433 (Other)

PURL Identifier: http://purl.umn.edu/198009 Published in: Asian Journal of Agriculture and Rural Development, Volume 02, Number 04 Page range: 632-640

Total Pages: 9

Series Statement: 13-162-AJARD-632-640

Record appears in: Asian Economic and Social Society (AESS) > Asian Journal of Agriculture and Rural Development





Author: Mazarura, Upenyu ; Chisango, C.

Source: http://ageconsearch.umn.edu/record/198009?ln=en



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