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Comparative Growth Analysis and Yield Performance of Glycine Max Under Jatropha Curcas Based Agrisilviculture System of Agroforestry in the Northern Part of Bangladesh

Niamjit Das
Department of Forestry and Environmental Science, School of Agriculture and Mineral Sciences, Shahjalal University of Science and Technology, Sylhet, Bangladesh.

Abstract/ Executive Summary:

This research was conducted at the Agroforestry Research Farm, Hajee Mohammad Danesh Science and Technology University to quantify the effects of pruning height in Jatropha curcas L. ( Jatropha) and fertility levels of the recommended dose of NPK in Glycine max L. ( Soybean ) on crop growth parameters and yield in the agrisilviculture system of Agroforestry. The pruning in Jatropha and fertility level favored growth parameters with varying magnitudes. Six growth indices like CGR, RGR, NAR, LAI, RLGR, and SLW were observed to be higher under various pruning heights and reduced under no pruning. After that, scale of yield varied with pruning heights and fertility levels. Grain, straw and biological yield of 100 cm pruning height in Jatropha increased by 15.38 %, 13.74 % and 14.61 % respectively in comparison to sole crop and other pruning height level. At that time, I showed that these three yields of 100 % of the recommended dose of NPK (100 % RDF) in Soybean are comparatively higher than other fertility level. Hence, proper pruning system and optimum fertility level are important for improving Soybean yield under Jatropha based agrisilviculture system and it ensures higher income to the farmers and efficient land management compared to its sole cropping.

Keywords: Growth indices, Pruning heights, Fertility levels, Glycine max, Jatropha curcas, Agrisilviculture

Location: Agroforestry Research Farm, Hajee Mohammad Danesh Science and Technology University, Dinajpur.

Start Date:

End Date:

Program Area: Farming System

Commodity: Soybean, Plant(s)

Objectives:

To determine the growth parameters and yield of Soybean under different pruning height in Jatropha and the fertility level in Soybean of Jatropha based agrisilviculture system of Agroforestry in the Northern Part of Bangladesh.

Methodology:

This research was carried out on Agroforestry Research Farm, Hajee Mohammad Danesh Science and Technology University, Dinajpur. The experimental plot was medium high land and the soil of the experimental site was silty loam in texture with 28.54% sand, 56.50% loam and 14.96% clay particles. The experiment was composed of a tree /shrub species Jatropha, spacing 3 m x 3 m, number of trees per plot 25, Soybean as intercrop, plot size 15 m x 15 m and number of plots 60. Seeds of Soybean were sown in 30 cm apart rows and seed to seed distance was 6 cm on 11 December 2012. Soybean crop with recommended NPK in the open was used as absolute or sole crop. The experiment was laid out in factorial Randomized Block Design comprising four cutting management viz., no pruning, 50 cm height, 100 cm height, 150 cm height in Jatropha and three fertility levels viz., 50 % of the recommended dose of NPK (50 % RDF), 100 % (110 kg N + 65 kg P₂O₅ + 42 kg K₂O ha^-1 ) of the recommended dose of NPK (100 % RDF), 150 % of the recommended dose of NPK (150 % RDF) in Soybean as intercrop with five replications. The sole cropping of Soybean was used as one rate of fertilizers ( 100 % of the recommended dose of NPK) and five replications. So, total number of plots was 65.All sampled green leaves were categorized into small, medium and large size groups and counted. Twenty leaves of each category were collected and a total of sixty samples of leaves was taken from each sampled plot and packed in a plastic bag. After that, the leaf area of each leaf sample was measured by a leaf area meter. Six growth parameters viz., CGR, RGR, NAR, LAI, RLGR and SLW were computed using the formulae proposed by Brown and Radford. For determination of dry weight, leaves were dried to electric oven at 60°C for 72 hours, followed by weighing by digital balance. Yield viz. Economic yield (grain yield), Straw yield and biological yield ( kg ha^-1 ) were recorded at the maturity of the crop. The whole of yield data was collected and dried in the sun for three to four consecutive days. After that, it was measured with a balance meter. The crop data obtained during the course of the investigation were analyzed using Factorial Randomized Block Design Panse and Sukhatme and critical difference (CD) was calculated at 5% probability level.

Source of Information: Journal of Forests, 2015, 2(2): 14-23, SSN(e): 2409 - 3807/ISSN(p): 2413-8398

Article Link (Online Journal): URL: www.pakinsight.com, DOI: 10.18488/journal.101/2015.2.2/101.2.14.23

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that pruning in Jatropha is promising for agrisilviculture since the yield increases of Soybean were highest under pruned Jatropha (100 cm pruning height) in comparison to no pruning. Therefore, it is suggested to adopt tree management (pruning) practices to maximize the yield increases of Soybean which would be utilized by the Jatropha and production ability can be improved substantially by the use of recommended dose of NPK (100 % RDF) for Soybean . The standing biomass (stem + branches ) ensures additional benefit from the system. However, the overall productivity (trees + crops) in Agroforestry systems is higher than that in sole cropping systems and has the potential to improve the socioeconomic conditions of farmers.

Knowledge Management: Journal