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Nutrient Management for Sustaining Soil Fertility and Yield of Wheat-mungbean-t. Aman Cropping Pattern (2000-2019)

N. Mahmud
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh.

N. Salahin
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

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

S. Akhter
Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Abstract/ Executive Summary:

A long term field experiment on Wheat-Mungbean-T.aman cropping pattern has been carried out in High Ganges Floodplain Soils (AEZ-11) of RARS, Jashore from 2000-2019. The objectives were to find out sustainable fertilizer recommendations, monitor soil health, estimate uptake of different nutrient for the cropping pattern and to make a balance sheet for each of the nutrient. There were six treatments viz. 125% recommended dose (RD), 100% RD, 75% RD, 50% RD, Farmers' practice and native nutrient. The design was RCB with three replications. Results showed consistently highest yield from each of the crops of the pattern obtained with 125% RD treatment and which were statistically similar to 100% RD treatment. Highest total rice (system) yield of 13.02 t ha^-1yr^-1 was obtained from T₁ treatment (125% RD). Lowest total rice (system) yield of 6.90 t ha^-1yr^-1 was obtained from control i.e. native fertility treatment (T₆). Highest gross margin of 119618 Tk^-1ha^-1yr^-1 was also obtained from T₁ treatment (125% RD). The highest benefit cost ratio of 1.85 was found in T₁(125% RD) treatment.

Keywords: Fertilizer, Wheat, Mungbean, T.aman, Cropping pattern, Soil health, Nutrient, AEZ

Location: High Ganges Floodplain Soils (AEZ-11) of RARS, Jashore, Bangladesh

Start Date: 00-00-2000

End Date: 00-00-2019

Program Area: Crop-Soil-Water Management

Commodity: Cropping pattern, Nutrient solution

Objectives:

i) to find out sustainable fertilizers recommendations for wheat-mungbean-T.aman cropping pattern, ii) to monitor soil health after each cropping pattern and iii) to estimate uptake of different nutrients and to make a balance sheet for each nutrient.

Methodology:

This field trial has been conducted in High Ganges Floodplain Soils (AEZ-11) of RARS, Jashore from the period of 2000-2019. A description of nutrient status of initial soils prior to fertilization is presented.

The experiment was laid out in a RCB design with six treatments replicated three times. The unit plot size was 5m ´ 6m. The treatment combinations were T₁=125% of recommended dose (RD) (RD =120-35-75-20-5 kg of N P K S Zn ha^-1), T₂=100% of RD, T₃=75% of RD, T₄=50% of RD, T₅=Farmers' practice and T₆=Native nutrient. The Farmers' practice treatment was 60-40-30 kg ha^-1 of NPK respectively. The tested wheat variety was BARI Gom-30. All PKSZn and ²/₃^rd of N were applied at the time of final land preparation and the remaining ¹/₃^rd of N was applied after first irrigation (17-21 DAS). The seeds were sown in 4^th week of November and were harvested in 2^nd week of March. Only nitrogen was applied @ 20 kg N ha^-1 in all the plots except the native nutrient treatment for the second crop mungbean (Var. BARI Mung-6). The seeds were sown in the 2^nd week of March and first picking was on the 2^nd week of May and continued up to 1^st week of June. Then the total biomass was incorporated in the soil.

The same sequence was maintained in T.aman (BINA Dhan-7) for fertilizer treatments. The seedlings were transplanted in the 1^st week of August and harvested in the 1^st week of November. Records on some yield parameters were taken at certain growth stages of all the crops of the pattern. Data were analyzed by ANOVA (using Crop Stat 7.2) to evaluate differences between treatments, and the means were separated using least significant difference (LSD) at the 5% level of significance (p<0.05).

Source of Information: Annual Research Report 2019-2020, Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

125% and 100% recommended dose of chemical fertilizer produced identical yield and BCR of Wheat-Mungbean-T.Aman cropping pattern. This fertilizer combination sustained the total rice (system) productivity over the years. The average soil fertility status was mostly unchanged, somewhere it was increased. Potassium and sulphur showed negative balance, more potassium and sulphur are to be added (to improve soil status). So, through this practice the soil nutritional status may be sustained.

Knowledge Management: Report/Proceedings