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PRODUCTIVITY AND RESIDUAL EFFECTS OF GREEN MANURE LEGUMES IN CEREAL-BASED CROPPING SYSTEM IN POTHOWAR PLATEAU

Sultani, Muhammad Ibrahim (2004) PRODUCTIVITY AND RESIDUAL EFFECTS OF GREEN MANURE LEGUMES IN CEREAL-BASED CROPPING SYSTEM IN POTHOWAR PLATEAU. PhD thesis, University of Arid Agriculture, Rawalpindi.

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Abstract

Investigations which included two experiments were carried out at the National Agricultural Research Centre (NARC), Islamabad, Pakistan during 2001-2003. In first experiment effect of different green manuring crops namely Cyamopsis tetragonaloba (L), Vigna umbelate (Thumb) and Sesbania aculeata (Linn) and levels of phosphorus fertilizer (0, 30, 60 and 90 kg ha-1) on biomass of green manure crops, organic matter addition as of incorporation of biomass, improvement in N soil fertility status, impact on physical properties and ultimately productivity of wheat was investigated. The second experiment was carried to investigate the effect of phosphorus sequencing and green manure crops mentioned in experiment one on various parameters mentioned above. Results of the experiment indicated that maximum fresh biomass (22.57 t ha-1) and dry biomass (4.33 t ha-1) was produced by Sesbania aculeata followed by fresh biomass of Cluster bean (19.31 t ha-1) and dry biomass (3.70 t ha-1). Lowest fresh biomass was produced by Rice bean (16.86 t ha-1) and dry biomass (3.25 t ha-1). Application of P further enhanced above ground green biomass production upto 28.59 t ha-1. Incorporation of Sesbania biomass as green manures on the average increased soil organic matter by 20%, N by 23 %, P by 71 % and K by 29%; these manures further significantly reduced soil bulk density (5%), enhanced porosity (8%), moisture retention (5%) and available water (17%). Green manure increased total biomass of succeeding wheat crop by 16%. There was significantly positive interaction of green manure legumes and P fertilization by 20%. Furthermore their integrated residual effect of 3% to 5% was noted on various parameters in the succeeding crop year.

Item Type:Thesis (PhD)
Uncontrolled Keywords:farming systems, green manure, nutrient cycling, phosphorus levels, biomass, nitrogen concentration, crude protein, fiber content, soil organic matter, cyamopsis tetragonaloba (l), vigna umbelate (thumb), sesbania aculeata (linn)
Subjects:Agriculture & Veterinary Sciences(a) > Agriculture(a1) > Forestry, horticulture(a1.3)
ID Code:376
Deposited By:Mr. Muhammad Asif
Deposited On:04 Aug 2006
Last Modified:04 Oct 2007 21:00

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