Abstract
Green manures can enrich soils with organic matter and nitrogen. An experiment was conducted at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh, Bangladesh to evaluate the residual effects of different green manures on the growth and yield of wheat (BARI Gom-26). The experiment containing nine treatments were laid out in a randomized complete block design with three replications. The treatments were T1 [No green manure + 100% Recommended dose of nitrogen (RDN)], T2 (Sesbania aculeata + 75% RDN), T3 (Sesbania aculeata + 50% RDN), T4 (Sesbania rostrata + 75% RDN), T5 (Sesbania rostrata + 50% RDN), T6 (Vigna radiata + 75% RDN), T7 (Vigna radiata + 50% RDN), T8 (Vigna mungo + 75% RDN), and T9 (Vigna mungo + 50% RDN). Residual effects of green manures with RDN significantly increased the yield attributes as well as grain and straw yields of wheat. Further, green manures exerted significant residual effects on grain, straw and total N uptake of wheat. Among various treatments with green manures, the performance of T4 (Sesbania rostrata + 75% RDN) was the best as it produced the highest grain yield (4.28 t ha-1), straw yield (4.74 t ha-1) and total N uptake (108.02 kg ha-1). The use of green manures slightly increased the organic matter content, total N and available P, K, and S contents of the post-harvest soils. As regards to the contribution of various green manures on yield contributing characters and yield of wheat, performances of two Sesbania species viz., S. aculeata and S. rostrata in association with 75% N fertilizer were effective.Asian J. Med. Biol. Res. December 2016, 2(4): 624-630
Highlights
Wheat is one of the leading cereal crops grown around the world in diverse environments
The tallest plant of 83.13 cm was found in T4 (Sesbania rostrata + 75% Recommended dose of nitrogen (RDN)) which was identical to T7 (Vigna radiata + 50% RDN), T6 (Vigna radiata + 75% RDN) and T2 (Sesbania aculeata + 75% RDN) with the values of 83, 82.70 and 82.50 cm, respectively
Ehsan et al (2014) and Boparai et al (1992) studied the residual effects of green manures on wheat crop and reported that incorporation of green manure (Sesbania aculeata) produced the highest plant height, spike bearing tillers m-2, number of grains spike-1 and 1000-grain weight and increased root density of wheat grown after rice
Summary
Wheat is one of the leading cereal crops grown around the world in diverse environments. The depletion of soil organic matter caused by high cropping intensity, use of modern crop varieties, very little use of crop residues, limited practices of green manure-based cropping patterns are the main reasons of low productivity and this organic matter depletion is considered as one of the most serious threats to future sustainability of agriculture in Bangladesh (Salahin et al, 2013). To overcome these constraints, efficient soil fertility and fertilizer management through maximum return of crop and animal residues to soil, balanced use of chemical fertilizers, use of bio-fertilizers, green manures in
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