Response of Grasses and Legumes in Mixtures and Pure Stand To Phosphours and Nitrogen Fertilization at El Damazin Area.

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Date
2015-05-05
Authors
Abbasa, Nawal Bashir
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Publisher
University of Khartoum
Abstract
A field experiment was conducted for two consecutive seasons (1999/2000 and 2000/2001) at the Demonstration Farm of EL Damazin Research Station, Blue Nile State, Sudan to investigate the effect of nitrogen and phosphorous fertilization on growth, yield and quality of forage for grasses and legume species in mixture and pure stand under rainfall. The nitrogen levels were 0, and 40 kg Urea/ha in the form of urea (46% N). The phosphorous level were 0 and 50 Kg P2O5/ha in the form of triple superphosphate. The cropping systems include two legume species; clitoria and philipesara and two grass species; signal (Zabrtaya) grass and Dinebra (Mamleiha) in pure stand and mixture (grass and legume). The design used was split-split plot design, with three replications, in which the nitrogen levels in the main plots and the phosphorous levels in the sub-plots and the cropping systems in the sub-sub-plot. The results revealed that nitrogen fertilization significantly increased number of flowers in the second season, number of pods per unit area and forage yield in the second season for legumes. Nitrogen fertilization reduced days to 50% flowering in the first season for legumes. For grasses, addition of nitrogen fertilizer significantly increased number of tillers per plant in the second season and number of seeds per spike in the first season. Nitrogen significantly reduced days to 50% flowering for grasses in the two seasons. However, nitrogen did not affect most growth attributes and forage yield for grasses in the two seasons. Phosphorous fertilization for legumes significantly increased number of flowers per plant and number of pods per unit area in the first season. Addition of phosphorous did not affect days to 50% flowering for legumes. Phosphorous did not affect grasses in all measurements. Clitoria in mixture and in pure stand gave taller plants in the second season, higher number of leaves in the first season. Phillipesara, in pure stand and mixture, produced higher number of flowers per plant and higher number of pods per unit area. Signal grass, in pure stand and mixture, gave taller plants and more leaves compared to Dinebra. Dinebra produced more tillers compared to Signal grass. Signal grass produced higher number of spikes per unit area compared to Dinebra, while Dinebra gave more seeds per per spike. Clitoria in pure stand and mixture reached 50% flowering earlier than phillpesara in the first season. The difference between grasses in days to 50% flowering was not significant. Phillipesara in pure stand gave higher forage yield compared to clitoria. For grasses in pure stand, Signal grass produced higher yield compared to Dinebra. Generally grass-legume mixture gave higher forage yield compared to grasses and legume species in pure stand. The highest forage yield was obtained with phillipesara-signal grass mixture followed by Pillipesara-Dinebra mixture. Nitrogen and phosphorous application slightly increased crude protein. Nitrogen fertilization decreased crude fiber and phosphorus decreased fibre in the first season. Generally crude protein was significantly higher in legumes compared to grasses. Crude protein was significantly higher in grass-legume mixtures compared to grasses in pure stand. Crude fibre was significantly higher in grasses in pure stand compared to legumes and grass legume mixture. Clitoria gave higher crude protein content and Dinebra gave higher crude fibres content
Description
2003
94 Pages
Keywords
Phosphorous;Nitrogen;Eldamazin Area;flower;seasons;protein;fibre ; grass;legume
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