אסיף מאגר המחקר החקלאי

Efficiency of fallow as a store for fertilizer nitrogen in a semi-arid region

Year:

1985

Source of publication :

Authors :

Volume :

105

Co-Authors:

Seligman, N.G., Volcani Center, Agricultural Research Organization, Bet Dagan 50250, Israel
Feigenbaum, S., Volcani Center, Agricultural Research Organization, Bet Dagan 50250, Israel
Benjamin, R.W., Volcani Center, Agricultural Research Organization, Bet Dagan 50250, Israel
Feinerman, D., Volcani Center, Agricultural Research Organization, Bet Dagan 50250, Israel

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Abstract:

Fertilizer nitrogen recovery under fallow and under a wheat crop (Triticum aestivum L., Cv. Miriam) grown on a deep loessial silty loam (Calcixerollic Xerochrept), was studied with 18N labelled KN03. The labelled nitrogen was applied (at a rate of 180 kg/ha) to 30 cm diameter microplots enclosed in hard plastic tubes that protruded 5 cm above the soil surface. In the 1st year of the experiment there was a long dry spell during the main part of the growing season and plant dry-matter yields were low. The 2nd year was wet, with heavy rain early in the season. About one-third of the fertilizer N applied to the fallow was lost from the top 60 cm layer in the 1st year. Most of the fertilizer N remaining in the soil as mineral N at the end of the first season was lost in the 2nd year. The possible reasons for such low N-conservation efficiency are discussed. © 1985, Cambridge University Press. All rights reserved.

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