S. Noor
Soil Science Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur
N. C. Shil
Soil Science Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur
M. A. Haque
Soil Science Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur
A. T. M. Farid
Soil Science Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur
Field experiments on broccoli-okra cropping sequence were carried out on Grey Terrace Soil under AEZ-28 of Gazipur with 4 levels (0, 2.5, 5.0 and 10 mtha-1) of poultry manure (PM), three levels (0, 2.5 and 10 mt ha-1) of cowdung (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 mt ha-1 for 2002-2003 & 2003-2004, respectively) of broccoli was obtained in T1 (100% RD + 2.5 mt PM ha-1), which was significantly higher over all other treatments except T6 (50% RD + 10 mt PM ha-1) 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 mt ha-1) 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% RD + 5 mt PM ha-1) appeared to be the best suited combination because of its higher gross margin (Tk. 5,25,827 ha-1 yr-1), 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.
Broccoli, Okra, Integrated Nutrient Management, Organic manure, Chemical fertilizer
Central Farm of Bangladesh Agricultural Research Institute (BARI), Joydebpur
Farming System
1) To find out the response of broccoli to chemical fertilizers and organic manure;
2) To determine the optimum rates of chemical fertilizer and organic manure and
3) To evaluate the residual effect of organic manure and chemical fertilizer on Okra
The experiment was conducted at the central farm of the Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during the years 2002-2003 and 2003-2004. The soil belongs to the Chhiata series of the Grey Terrace Soils AEZ-28. Data on some physical and chemical properties of initial soil samples collected from 0-20 cm depth from the experimental fields have been presented. Poultry manure (PM) and cowdung (CD) used in the experiment were analyzed for nutrient content in them. The experiment was set up in a randomized complete block design (RCBD) with 12 treatments having 3 replications. There were 36 plots each measuring 3 m × 2.4 m. Twenty five days old healthy seedlings of broccoli were transplanted on 18 and 24 November of 2002 and 2003, respectively with a spacing of 60 cm from row to row and 40 cm from plant to plant accommodating 30 plants in each plot. Urea, TSP, MP, Gypsum, Zinc oxide, boric acid and sodium molybdate were used as a source of N, P, K, S, Zn, B and Mo, respectively as per conventional recommended dose. Harvesting was done when the heads attained proper size and were at right stage of maturity. The harvesting of edible broccoli heads was started on 30 January 2003 for the first year and 02 February 2004 for the second year. The yield and yield attributing data were analyzed statistically using IRRISTAT package. The yield of Okra was converted to the yield of broccoli in respect of their market price for the calculation of broccoli equivalent yield. For Okra, the tested variety was BARI Dherosh-1. The seeds were sown on 24 and 27 March of 2003 and 2004, respectively with a spacing of line to line 60 cm and plant to plant 50 cm. Only recommended dose of N150 kg ha-1 was applied as per treatment to the current crop. Fruits at the edible stage were harvested at every alternate day starting from 13 and 15 May for 2003 and 2004, respectively. Data on yield and yield parameters of okra were recorded and statistically analyzed using the similar package that used for broccoli.
S. Noor, N.C. Shil and M.A. Haque, 2012. Integrated Nutrient Management for sustaining Crop yield & Soil fertility. Soil Science Division, Bangladesh Agril. Res. Inst. Publication no.-14
A package of 10 mt ha-1 poultry manure (PM) along with 50% RD of chemical fertilizers (N70, P22.5, K40, S12.5, B0.5, Mo0.25 kg ha-1) 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 prescriped 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 mt PM ha-1) may be recommended for broccoli-okra cropping sequence in the study area.
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