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EFFECT OF STORAGE TIME ON WEED SEEDLING EMERGENCE AND NUTRIENT RELEASE IN CATTLE MANURE

Published online by Cambridge University Press:  30 March 2001

E. RUPENDE ,
O. A. CHIVINGE  and
I. K. MARIGA
E. RUPENDE
Affiliation:
Department of Crop Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe
O. A. CHIVINGE
Affiliation:
Department of Crop Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe
I. K. MARIGA
Affiliation:
Department of Crop Science, University of Zimbabwe, PO Box MP 167, Mount Pleasant, Harare, Zimbabwe
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Abstract

An experiment to determine weed spectrum, weed seedling numbers, temperature and nutrient changes in manure heaped for one to five months was undertaken over two seasons. Weed seedling numbers in manure heaped for one to five months decreased significa ntly by 65–70%. The weed spectrum comprised 17 broadleaf weed species of which Amaranthus hybridus, Leucasmartinicensis and Nicandra physalodes were most prevalent. There were six grasses with Eleusine indica and Cynodon dactylon being dominant. Temperature increased from 20 °C in the unheaped manure to averages of 34 and 42 °C in manure heaped for three and five months respectively in the two seasons. In both season s nitrogen and potassium became more available as the period of manure heaping increased while phosphorus decreased. It was concluded that heaping manure for three months significantly reduces weed seed viability and enhances the availability of some nutr ients.

Type
Research Article
Information
Experimental Agriculture , Volume 34 , Issue 3 , July 1998 , pp. 277 - 285
Copyright
© 1998 Cambridge University Press

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