Multipurpose tree prunings as a source of nitrogen to maize under semiarid conditions in Zimbabwe 1. Nitrogen-recovery rates in relation to pruning quality and method of application
Authors: Mafongoya, P.L.; Nair, P.K.R.
Source: Agroforestry Systems, Volume 35, Number 1, 1996 , pp. 31-46(16)
Abstract:When multipurpose-tree (MPT) prunings are used as a source of nitrogen to annual corps in agroforestry systems, it is important that high levels of N recovery are attained. In order to test the effect of pruning quality and method of pruning application on N-recovery rates, a field experiment was conducted using prunings of five MPT species and two methods of application (surface versus incorporation). There was an interaction of pruning quality and method of pruning application on N recovery and maize grain yield. For most MPT species used, incorporated prunings gave high nitrogen recovery compared to surface applied prunings. In order to achieve synchrony between N supply from prunings and N demand by a maize crop, relatively large amounts of N should be released into the soil before peak N demand by the maize crop. This could be achieved by incorporating adequate quantities of high quality prunings such as those of Cajanus cajan and Leucaena leucocephala.
Document Type: Regular Paper
Affiliations: University of Florida, School of Forest Resources and Conservation, 118 Newins-Ziegler Hall, Gainesville, FL 32611, USA
Publication date: January 1, 1996