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Long-term Integrated Nutrient Management for Sustaining Soil Fertility and Yield of Maize-mungbean- T. Aman Cropping Pattern (2015-2016)

M. A. HAQUE
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

R. A BEGUM
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Abstract/ Executive Summary:

A long-term field experiment on Maize-Mungbean-T. aman cropping pattern was conducted in the Grey Terrace Soil (AEZ-28) of Gazipur during the year of 2007-2015 with the objective of finding out suitable fertilizer combination for sustainable yield of the pattern, monitoring soil health as affected by chemical fertilizers and organic manures and to make a balanced sheet of each nutrient. There were six treatments viz. T₁: Native fertility, T₂: MYG (FRG) from chemical fertilizers + 5 t ha^-1CD, T₃: HYG (STB) from chemical fertilizer, T₄: HYG (STB) from chemical fertilizer + 5 t ha^-1CD, T₅: HYG (STB) from chemical fertilizer + 3 t ha^-1PM and T₆: MYG (FRG) from chemical fertilizers. The experiment was laid out in RCB design with four replications. Data revealed that the T₅ produced the highest yield of maize grain consistently in nine maize crops. The legume component (mung bean) produced over 1 t ha^-1 grain and added over 13 t ha^-1 green biomass. The third crop (T. aman rice) also produced the highest yield in the T₅ treatment. The yields of maize and rice were statistically similar to all other fertilizer treatments. The modified treatment T₂ since 2011-12 produced statistically similar yields of maize and rice with the T₅. The native fertility treatment produced the lowest yield. This trend of influence was consistent for almost all the yield contributing characters of maize and rice. The nutrient removal by maize and rice was standard and an apparent balance showed negative balance for some nutrients.

Keywords: Maize-Mungbean-T.aman, Cropping cycle, Judicious fertilizer, AEZ, BINA Dhan 7

Location:

Start Date: 00-00-2007

End Date: 00-06-2015

Program Area: Farming System

Commodity: Soil fertility, Cropping pattern

Objectives:

a) to find out judicious fertilizer recommendation for Maize-Mungbean-T.aman cropping pattern for sustainable yield, b) to monitor soil health after each cropping cycle and c) to estimate uptake of different plant nutrients and make a balance sheet for each of the nutrients.

Methodology:

The field experiment was initiated in the Chhiata series (Areic Albaquepts) at Joydebpur (AEZ-28) during 2007-08 and continues. The initial soil samples, collected from depth of 0-15 cm were analyzed in the laboratory following standard methods. Initial values of some important soil physical and chemical parameters of the experimental soil are presented. The experiment was laid out in a randomized complete block design with four replications. Six different treatments viz. T₁: Native fertility, T₂: MYG (STB) from chemical fertilizers + 5 t ha^-1 CD, T₃: HYG (STB) from chemical fertilizer, T₄: HYG (STB) from chemical fertilizer + 5 t ha^-1 CD, T₅: HYG (STB) from chemical fertilizer + 3 t ha^-1 PM and T₆: MYG (STB) from chemical fertilizer were selected for different plots randomly. The unit plot size was 5m x 6m. The tested crop for maize was BARI hybrid maize 9. Maize seeds were sown in line with 60 cm row to row and 20 cm seed to seed spacing in November. Two seeds were placed in each hole and thinned out to one when the seedlings were established properly. Seeds were treated with vitavex prior to seeding. Fertilizer N-P-K-S-Mg and B were supplied from urea, TSP, MP, Gypsum, Magnesium sulphate and Boric acid respectively. All PKSMgB and ¹/₃ of N were applied at the time of final land preparation. The remaining two third of N were applied as top dress at 30 and 60 days after sowing. Three irrigations and other intercultural operations were done as and when required. The maize was harvested at the end of April, each year. Data on yield and yield contributing characters were recorded and statistically analyzed. Duncan’s Multiple Range Test (DMRT) was used to determine the significant differences between treatments (Steel and Torrie, 1960). Plant samples and post harvest soil samples were collected from each plot for chemical analysis at three years interval. After maize BARI Mung 6 was sown in the plots and except the native fertility all plots received 20 kg N ha^-1. After two or three picking of the grains the green biomass is ploughed down into the soil and left for decomposition until the T.aman is transplanted. For T. Aman rice, the variety BINA Dhan 7 was used in the experiment. Transplanting was done during the middle of July with a row to row spacing of 20 cm and plant to plant spacing of 15 cm. The treatment combinations for rice showing fertilizer rates are outlined in the table 3c. All fertilizers including 1/3^rd of N were applied before transplanting. Rest of N was applied in two installments at 15 and 45 days after transplanting. T. Aman rice was harvested in the third week of October.

Source of Information: Annual Research Report 2015-2016, Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh.

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The experiment has completed eight cropping cycles and in the first cycle mungbean could not be fit in. In the year 2009 - 2014 mungbean was cultivated and biomass was plough down into the soil. Although CD and PM produced higher yields over the FRG rates, increase was not substantial or statistical. The yield and growth were affected where organic manures were not added. The treatment T₂ (MYG + 5 t ha^-1 CD) produced statistically similar yields with that of T₄ and T₅ indicating that when organic manures are added chemical fertilizers can be reduced to certain extent (15-20%) for even HYG yield goal.

Knowledge Management: Report/Proceedings