Abstract
A series of experiments were conducted on the Agronomy farm and laboratory of Sher-e-Bangla Agricultural University to demonstrated a promising way of increasing soil organic matter, total N in pre sown and postharvest land by green manure cultivation and reducing the inorganic fertilizer inputs in rice production and finally observed the quality of grown T. aman seed in laboratory condition. Several green manures were found more potential in two years regarding their plant height, dry biomass production and better performance concerning organic matter, nitrogen and potassium contribution to soil and increased rice yield. Morphological characteristics of eight green manure crops were studied and incorporated at 45DAS for decomposition. One month after decomposition of green manure, rice (BRRI dhan66) plant was transplanted with 100% NPK (F1) and 50% NPK (F2) and pre sown rice soil, post-harvest soil nutrient statuses were studied. Result showed that Pre shown rice soil increased 0.5 to 0.6% SOM (2nd year), 0.04% soil N (both year) and 0.04% soil K (1st year) which ultimately increase rice yield 62% to 68% (with F1) and 10% to 42% in 1st and 2nd year. Post-harvest soil nutrient status shown the positive balance of (0.1% to 1%) organic matter and total N (0.04% to 0.7%) in the 1st years and 2nd years and P was found drastically increased in 2nd year, respectively. Germination%, germination energy%, seedling length, fresh and dry weight of six month stored rice seedling also found highest from S. rostataand S. aculeataunder laboratory condition. Incorporation of Sesbaniaaculeata, S. rostrata, V. unguiculataand Crotalaria junceaas GM with N significantly influenced the grain yield of rice and pre and post-harvest soil. Asian J. Med. Biol. Res. 2021, 7 (4), 298-311
Highlights
To meet up excessive food demand for increasing population, soil fertility in Bangladesh is declining day by day and the organic matter status of soil is below 1% in more than 60% of total cultivable lands whereas ideal level is 3% (Islam, 2006)
Materials and Methods A group of experiments was conducted at the Agronomy farm of Sher-e-Bangla Agricultural University during April, 2015 to April, 2017 to evaluate the morphological performance of different green manuring crops and its residual effect on rice yield and post-harvest rice soil performances through adding biomass, dry matter, organic matter, N, K and P accumulation and stored T. aman seed performance in laboratory
At 45 DAS (1st year), S. rostrata showed 148% tallest plant height followed by S. aculeata (104%), V. unguiculata (102%) and L. leucocephala (86%) compared to V. mungo
Summary
To meet up excessive food demand for increasing population, soil fertility in Bangladesh is declining day by day and the organic matter status of soil is below 1% in more than 60% of total cultivable lands whereas ideal level is 3% (Islam, 2006). Inorganic fertilizers are very expensive to make the soil fertile even though green manure is a very low cost technology in reducing fertilizer costs and increasing soil fertility. Green manure crops are one of the most effective ways to improve the soil. Green manures belonging to the pea and bean family (legumes) have the additional capacity of storing (fixing) nitrogen from the air to their root nodules. Green manure is a glimmer of hope in that aspect as it has the ability to fix atmospheric nitrogen and improves soil fertility. Green manure is a glimmer of hope in that aspect as it has the ability to fix atmospheric nitrogen and improves soil fertility. Khind et al (1983) spotted that, when 30, 45 and 60 days old crop with dhaincha (Sesbania aculeata) incorporated one
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