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Integrated Nutrient Management for Broccoli Okra Cropping Sequence

S. NOOR
Division of Soil Science, Bangladesh Agriculture Research Institute, Cazipur

N.C. SHIL
Division of Soil Science, Bangladesh Agriculture Research Institute, Cazipur

M. A. HAQUE
Division of Soil Science, Bangladesh Agriculture Research Institute, Cazipur

A. T. M. FARID
Division of Soil Science, Bangladesh Agriculture Research Institute, Cazipur

Abstract/ Executive Summary:

Field experiments on broccoli-okra cropping sequence were carried out on Grey Terrace Soil under AEZ-28 of Gazipur with four levels (0, 2.5, 5.0 and 10 m t/ha) of poultry manure (PM), three levels (0, 2.5 and 10 m t/ha) of cow-dung (CD) and different portions of the recommended dose (RD) of chemical fertilizers to find out the optimum rates of fertilizers and organic manure for maximizing the yield. The highest curd yield (25.34 and 23.5 m t/ha for the first and second year, respectively) of broccoli was obtained in T₁ (100 % R D + 2.5 m t PM/ha). which was significantly higher over all other treatments except T₆ (50% R D + 10 m t PM/ha)- the second highest yield provider. The nutrient residue in T₆ along with renewed application of 50% recommended N produced the higher fruit yield (13.3 and 10.2 m t/ha) of okra (second crop), which was almost equal to T₁ and both the treatments gave significantly higher yield over rest of the treatments . However, from the economic point of view, treatment package, T₅ (50% R D + 5 m t PM/ha) appeared to be the best suited combination because of its higher gross margin (Tk. 5,25,827/ha/year), marginal rate of return (5404 %) and capability in enriching soil fertility and hence may be recommended for broccoli-okra cropping sequence in the study area.

Keywords: Broccoli, okra, Integrated nutrient, Organic manure, Chemical fertilizer

Location: Joydebpur, Gazipur

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity:

Objectives:

(i ) to find out the response of broccoli to chemical fertilizers and organic manure, (ii ) to determine the optimum rates of chemical fertilizer and organic manure for broccoli grown under integrated nutrient management approach and (iii ) to evaluate the residual effect of organic manure and chemical fertilizer on okra.

Methodology:

The experiment was conducted at the central farm of the Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during 2002 - 2003 and 2003-2004. The soil belongs to the Chhiata series of the Grey Terrace Soils (Aerie Albaquept), AEZ-28. Data on some physical and chemical properties of initial soil samples collected from 0-20 cm depth from the experimental fields. Poultry manure (PM) and cowdung (CD) used in the experiment were analyzed for nutrient content in them. The PM used for this study contained 1.8, 2.0, 1.2, 1 .3 and 1.2% N, P, K , S and Zn, respectively while nu trient composition in CD was 0.8, 0.4, 0.6, 0.15 and 0.40% for N, P, K, S and Zn, respectively. The manure samples were analyzed by digesting with diacid (HN0₃ : HCL0₄ = 5 : 1) mixture. Particle size distribution was done by hydrometer method (Day 1965); the textural class was ascertained using Marshals's triangular coordinates (USDA 1951). Soil pH was measured with a combined glass electrode at a soil: water ratio of l : 2.5 (Jackson 1973). Total N was determined by Micro-Kjeldhal method (Black 1965). Exchangeable Ca, Mg, K were measured with ammonium acetate extraction procedures. Available P was extracted with sodium bicarbonate (Olsen el al.. 1954). Turbidimetric method (Page et al. 1982) was used for the determination of available S. Hot water extraction procedure was followed for the measurement of available B. DTPA extraction procedures were used for the determination of available Cu, Fe, M n and Zn. Data on yield and yield parameters of okra were recorded and statistically analyzed using the similar package that used for broccoli.

Source of Information: J. Asiat. Soc. Bangladesh, Sci., 33(1): 85-94, June 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A package of 10 m t/ha poultry manure (PM) along with 50% RD of chemical fertilizers (N₇₀P₂₂₅K₄₀S _12.5B_0.5M₀_{. 25} kg/ha) appeared as the best combination for sustaining the yield of broccoli and to maintain soil fertility in the study area. The nutrient residue left from the said treatment (T₆) in combination with supplemental nitrogen provided a good harvest for the second crop (okra) and thus farmers may reduce the costs of both chemical fertilizers and organic manure if they adopt the prescribed sequence. But as per economic analysis, the said treatment (T₆) appeared as cost dominated. However, due to its reasonably higher gross margin, marginal rate of return and capability of soil fertility enrichment, the treatment package T₅ (50% RD + 5 m t PM/ha) may be recommended for broccoli-okra cropping sequence in the study area.

Knowledge Management: Journal