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Integrated Nutrient Management on Soybean in a Coastal Charland of Bangladesh

I. S. M. Farhad*
Soil Science Division, BARI, Gazipur, Bangladesh

M. A. Rahman
Department of Agronomy, SAU, Dhaka, Bangladesh

E. Jahan
Department of Agricultural Chemistry, SAU, Dhaka, Bangladesh

M. G. Azam
RARS, BARI, Hathazari, Chittagong, Bangladesh

N.R.Khan
Department of Agriculture Extension, Manikganj, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted at Char Jangalia under MLT site, Laxmipur, a coastal district of southern Bangladesh, during Rabi season of 2015-16 to evaluate the effect of integrated nutrient management on growth and yield performance of soybean (var. Glycine max L.). Six treatment combinations, viz. T1= Control, T2= Farmers practice (25-15 Kg NP ha^-1, T3= 100% recommended dose (30-25-55 Kg NP ha^-1, K), T4= 50 % recommended dose + 1.5 t ha^-1 vermicompost, T5= 50 % recommended dose + 5 t ha^-1 compost and T6=50 % recommended dose + 1.2 kg ha^-1 bio fertilizer were tested. The experiment was laid out in randomized complete block design with 3 replications. There were significant differences among the different treatment combinations in terms of yield and yield contributing characters. Integrated nutrient management with application of 50% of the recommended doses of urea, TSP, MoP, and biofertilizer (Bradyrhizobium) at the rate of 1.2 kg ha^-1 significantly increased most of the parameters, such as the plant height, number of nodule per plant, pods per plant, seeds per pod and seed yield. The highest seed yield (2.93 t ha^-1) was recorded from T6 while the lowest seed yield (1.83 t ha^-1) was obtained from T1. The highest gross return (Tk.117200 ha^-1) and gross margin (Tk. 71840 ha^-1) was obtained from T6, whereas the lowest gross return (Tk. 70400 ha^-1) and gross margin (Tk.27880 ha^-1) was obtained from T1. The overall results indicated that the application of integrated nutrient management of a combination of bio fertilizer with 50% N-P-K (15- 12.5-27.5 Kg ha^-1) of the recommended dose produced the maximum nodulation and seed yield of soybean in the southern coastal char land.

Keywords: Cost and Return, Soybean nodulation, Yield

Location: At Char Jangalia Multilocation Trial (MLT) site, Laxmipur district of southern coastal Bangladesh

Start Date: 00-11-2015

End Date: 00-04-2016

Program Area: Crop-Soil-Water Management

Commodity: Soybean, Fertilizer

Objectives:

This study was undertaken to analyze the effect of integrated nutrient management on nodulation, growth and yield of soybean in the southern coastal char land of Bangladesh.

Methodology:

A field experiment was conducted during Rabi season of 2015-2016 at Char Jangalia Multilocation Trial (MLT) site, Laxmipur district of southern coastal Bangladesh, which is under Young Meghna Estuarine Floodplain called Agro ecological Zone 18 to evaluate the effect of integrated nutrient management on soybean. Before conducting the experiment, initial composite soil samples at 0-15 cm soil depth over 10 spots were collected from the experimental plots and were analyzed in the laboratory following standard methods. The initial soil analysis values are presented in Table 1. The experiment was laid out in randomized complete block design with 3 replications. The unit plot size was 4m 3m. Soybean var. BARI Soybean-5 variety was used as the test crop in this experiment. Treatments were : T1 = Control, T 2= Farmers practice (25-15 Kg ha^-1 of N-P, survey of 20 farmers), T3= 100% recommended dose (30-25-55 Kg ha^-1 of N-P-K, FRG, 2012), T4 = 50 % recommended dose + 1.5 t ha^-1 vermicompost, T5 = 50 % recommended dose + 5 t ha^-1compost and T6 = 50 % recommended dose + 1.2 kg ha^-1biofertilizer. Seeds were taken in small polythene bags equal in weight for each pot and mixed with molasses @ 20g molasses kg^-1seeds. For each inoculation separate plastic bag was used and care was taken to avoid contamination of the inoculated and non-inoculated seeds. Then the inoculum (BinaSB-4) was mixed with the seeds @ 20 g kg-1 seeds for the treatment T6. The seeds were sown @ 60 kg ha^-1 on18 January 2016 in line with the spacing of 30 cm x 10 cm. Two irrigations were done during the crop duration. First irrigation was applied after 20 to 25 days of sowing before flowering and second irrigation at pod formation stage. Different intercultural operations and plant protection measures were taken as and when necessary to raise healthy crops. The crop was harvested on 20 April, 2016. Three (03) plants were randomly selected from each plot and carefully uprooted to study the nodule number. Soil from the root was removed carefully and the nodules were separated and counted at 30 DAS, 60 DAS and at harvest. Data were collected on an individual plant basis from ten (10) randomly selected plants of each plot in such a way that the border effect was avoided for high precision. Plant height and number of branches plant^-1 were recorded during harvest. Number of pods plant^-1, number of seeds pod^-1 and 100- seed weight were recorded after harvesting of the crop. Plot yield was recorded and then converted to t ha^-1. Analysis of variance and comparison of means were calculated separately with statistical package MSTAT-C programme (Gomez and Gomez, 1984). The means were compared using the least significance difference (LSD) test. The functional form of the linear relationship between a dependent variable Y and an independent variable X was calculated according to equation given by Gomez and Gomez, (1984). X represents the amount of change in Y for each unit change in X.

Source of Information: Bangladesh Agron. J. 2017, 20 (1): 77-83

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Based on the results, it may be concluded that integrated nutrient management of bio-fertilizer (Bradyrhizobium) along with 50% of the recommended dose of chemical fertilizers (N-P-K) was more effective than other fertilizer management packages in producing seed yield and economic return of soybean cultivation in the char areas under Young Meghna Estuarine Floodplain soil (AEZ 18f) of Bangladesh

Knowledge Management: Journal