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Effects of Long-term Mineral Fertilization and Manuring on Rice-rice Cropping Pattern in Sub-tropical Floodplain Soil

Md. Zahir Raihan
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Mohammad Forhad Hossain
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Taneya Farhana
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Mukul Mia
Department of Genetics & Plant Breeding, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Abdul Kader
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

An experiment was carried out both boro season (February–June, 2013) and aman season (July-December, 2013) in the permanent experimental field of the Department of Soil Science, Bangladesh Agricultural University (BAU), Mymensingh. The objectives of present research work were tosee the effects of long-term fertilization and manuring on soil fertility and yield of boro and aman rice in flood plain (Subtropical) soil (AericHaplaquepts). The experiment was laid out in a randomized complete block design with three replications. There were 10 treatment combinations viz, Control, N, NP, NK, NPK, NZn, NS, NSZn, NPKSZn and NPK+FYM. The results indicated that the yield contributing characters and yield of BRRI dhan28 (Boro rice) and BR11 (Aman rice) were significantly increased due to different treatments. For boro rice, the highest plant height (cm), 1000-grain weight (g), effective tiller hill^-1and biological yield (t ha^-1) were found in NPKSZn treatment. The highest grain yield and straw yield of boro ricewere also observed in NPKSZn treatment. Grain yield was increased by 71%, 119%, 127%, 132%, 133%, 144%, 161% and 200% over Control in NZn, NS, NK, N, NP, NPK+FYM, NPK, NSZn and NPKSZn treatments, respectively. Straw yield was increased by 82%, 83%, 98%, 110%, 112%, 139%, 145%, and 167% over Control in N, NP, NPK+FYM, NZn, NK, NPK, NSZn, NS and NPKSZn treatments, respectively. Again for aman rice, the highest number of unfilled grain panicle^-1, grain yield (t ha^-1) and harvest index (%) were recorded in NPKSZn treatment. Grain yield was increased by 79%, 85%, 87%, 97%, 116%, 117%, 159% and 165% over Control in NP, NZn, N, NPK, NPK+FYM, NK, NSZn, NS and NPKSZn treatments, respectively. Straw yield was increased by 119%, 121%, 135%, 142%, 149%, 152%, 200%, 217%, and 246% over Control in NP, N, NPK, NPK+FYM, NK, NZn, NPKSZn, NSZn and NS treatments, respectively.

Keywords: Effects, Mineral fertilization, Manuring, Rice-rice cropping pattern, Floodplain soil

Location: Department of Soil Science at Bangladesh Agricultural University farm, Mymensingh.

Start Date: 00-00-2013

End Date: 00-00-2013

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To the effects of long-term fertilization and manuring on soil fertility and yield of boro and aman rice in flood plain (Subtropical) soil (AericHaplaquepts).

Methodology:

A study was carried out during the boro and aman season of 2013 in the permanent manurial experimental field of the Department of Soil Science at Bangladesh Agricultural University (BAU) farm, Mymensinghto find out the effects of long term intensive fertilization on yield of rice. Topographically the area was slightly undulating but the experimental plot was fairly leveled. It was above normal flood level but sometimes the plot remained flooded for short time by rainwater during monsoon season .

The experiment was laid out in randomized complete block design with three replications. The whole experimental field was divided into three blocks which represented three replications of the experiment. Each block was subdivided into ten unit plots for placement of ten treatments of the experiment. The total number of unit plots of the experiment was 30. The size of the unit plot was 11.5 m x 6.5 m (74.75 m²). The unit plots were separated from each other by earthen ails of 25 cm width and 10 cm high. There was 50 cm width and 10 cm deep irrigation channel between the blocks. The experiment comprised of ten different treatment combinations of manure and fertilizers namely, control, N, NP, NK, NPK, NZn, NS, NSZn, NPKSZn and NPK+FYM.

After initiation of the field experiment, rice (boro and aman) was normally grown 2 times in a year following rainfed and irrigated rice based cropping patterns. Usually, boro rice is planted in November-December and is harvested in June-July, and the growing season of aman ranges from mid-July to mid-December. Irrigation water from a deep tubewell was given to the plots. Forty six rice crops were harvested up to the end of 2002 of which 29 were high-yielding varieties and 17 are local varieties. The boro rice (cv. BRRI dhan28) under study was ranked 67 and aman rice (cv. BR11) was ranked 68 rice crops up to the end of 2013. These two varieties have been developed by the Bangladesh Rice Research Institute (BRRI), Gazipur. The average yield of BRRI dhan28 is 5.5-6 t/ha. BR11 is a modern variety of rice and It gives an average yield of 6.5 t/ha under proper management (BRRI, 2010).Boro rice was harvested on 5 June 2013 and aman rice on 26 November and 5 December 2013 at maturity and threshed plot wise. Grain and straw obtained from each plot were dried and weighed carefully.

Source of Information: Asian J. Med. Biol. Res. 2015, 1(2), 222-229, doi: 10.3329/ajmbr.v1i2.25615

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Cropping patterns in Bangladesh are mainly rice-based. In most of the cases, farmers use only N fertilizer alone or N and P fertilizer or at best N, P, and K fertilizers combinedly. The nutrient elements namely S and Zn are found as deficient in Bangladeshi paddy soils. In addition, only use of chemical fertilizer is not judicious for producing any crop. Integrated use of chemical fertilizers and organic manure is necessary for crop production as well as maintaining soil fertility. Generally, soil productivity and health may be more sustainable with the integrated application of manure and inorganic fertilizers than that of only use of inorganic fertilizers alone. The findings of this experiment revealed that the recommended dose of NPKSZn gave the best yield in both boro and aman season.

Knowledge Management: Journal