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Cropping Pattern Based Micronutrient Application for Wheat-mungbean-t. Aman Crop Sequence Under Tista Meander Floodplain Soil at Rangpur

M. F. Islam
Principal Scientific Officer
Soil Science Division, Bangladesh Institute of Nuclear Agriculture (BINA), BAU Campus, Mymensingh-2202, Bangladesh

M. R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Jahiruddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

T. Sarmin
Agronomy Division, Bangladesh Institute of Nuclear Agriculture (BINA), BAU Campus, Mymensingh2202, Bangladesh; 2

Abstract/ Executive Summary:

Intensification of agricultural land use coupled with cultivation of modern varieties has remarkably increased in Bangladesh. This in turn has resulted in deterioration of soil fertility, with emergence of macro- and micro-nutrient deficiency of crops. With this point in view, a study was undertaken to evaluate the effect of different micronutrients on crops, and to determine the requirement of selected micronutrients for crops and cropping patterns in the Tista Meander Floodplain (AEZ 3). Crop experiments were conducted at BINA substation and farmers’ fields of Rangpur district within AEZ 3. In expt.-1, the field trials were done with six micronutrients (B, Zn, Cu, Mn, Fe & Mo) designed in an additive manner. These elements were imposed to the first crop and their residual effects were monitored on the next two crops over the patterns: wheat-mungbean-T. aman. The rates of micronutrient application were 3 kg Zn, 2 kg B, 2 kg Cu, 3 kg Mn, 5 kg Fe and 1 kg Mo per hectare, added as fertilizers such as ZnSO₄.7H₂O, H₃BO₃, CuSO₄.5H₂O, MnCl₂, FeSO₄.7H₂O and Na₂MoO₄, respectively. Other nutrients viz. N, P, K & S were applied at recommended rates to all plots; rationale was followed for the second and third crops. Intercultural operations were done whenever required. The results revealed that across the experimental sites, the crops were quite responsive to the added Zn and B. Positive effect of Cu was also noted in some cases. In the following year (expt. 2), two micronutrients, Zn and B were taken into the same cropping pattern and designed in a way to determine whether 1-crop, 2-crop or 3-crop application is necessary to achieve satisfactory crop yield. The rates of Zn application were 0, 2, 4 & 6 kg ha^-1, and the rates for B were 0, 1.5 and 3 kg ha^-1. The results show that Zn application at 4 kg ha^-1 coupled with B application at 1.5 kg ha^-1 to the first crop can meet their requirement for the subsequent two crops in a pattern. The present study suggests that cropping pattern based field trials with Zn, B and Cu need to be done at farm level in the high cropping intensity areas of this country in order to determine micronutrient requirement of crops.

Keywords: Cropping pattern, Tista Meander Floodplain, Micronutrient

Location: BINA substation and farmer's field, Rangpur

Start Date:

End Date:

Program Area: Farming System

Commodity: Cropping pattern

Objectives:

To evaluate the effect of micronutrients application on the yield of wheat, mungbean and T. aman rice crops and to find out the optimum rate of micronutrients for the wheat-mungbean-T. aman cropping pattern in AEZ 3.

Methodology:

A dominant cropping pattern experiments of wheat-mungbean-T. aman were set up at BINA substation and farmers’ fields at Rangpur Sadar in 2011-12 (expt. 1 in two locations) and in 2012-13 (expt. 2) at Kaunia upazila under Rangpur district. The objectives were to evaluate the effects of different micronutrients on the crops and to see the direct and residual effects of Zn and B as to determine the requirement of Zn and B for the wheat-mungbean-T. aman cropping sequence. The expt. 1 with seven treatments was set up in November 2011 in two locations with wheat the first crop of the cropping pattern followed by mungbean as a legume (2^nd crop) and T. aman rice (3^rd crop). It continued up to October 2012 by T. aman rice harvest. The expt. 2 was started at Kaunia upazila under Rangpur district in November 2012 and completed by T. aman harvest.

Source of Information: J Bangladesh Agril Univ 15(2): 140–147, 2017

Article Link (Online Journal): doi: 10.3329/jbau.v15i2.35055

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

There was a significant positive effect of Zn & B application on the grain yield of wheat. Apparently the treatment that had received Zn at 4 kg ha^-1 and B at 1.5 kg ha^-1 recorded superior yield. Similar yield was also obtained with Zn₆B₃treatment. Residual effect of Zn and B was also noticed in mungbean and T. aman rice yield. The field experiments showed a clear response of crops to Zn and B application. Crop response to Zn supplement was higher than that to B supplement indicating that Zn was more deficient than B in soils. Both Zn and B application had positive residual effect on the second and third crops in a cycle. The economic analysis shows that the wheat-mungbean-T. aman cropping pattern, the Zn₄B_1.5-Zn₀B₀-Zn₀B₀ treatments combination had the highest MBCR (11.7) followed by the Zn₂B_1.5-Zn₀B₀-Zn₀B₀combination (11.2 MBCR) and the Zn₄B_{1.5 -}Zn₀B₀-Zn₂B₀ combination (11.1 MBCR); then all others had MBCR in the range of 5.9-9.2.

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