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Effect of Long-term Fertilization on Soil Fertility and Rice Yield

M. H. Rahman
Scientific Officer
Soil Science Division, BINA, Mymensingh.

M. J. Abedin Mian
Department of Soil Science, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

A long-term field experiment was conducted during 1978-1993 on sonatala silt loam soil at Bangladesh Agricultural University farm, Mymensingh. The objectives of the experiment were to study the effect of long-term fertilization on the yield of rice and soil fertility. Results indicated that the grain yields of rice increased due to application of N and P upto 1981. The combined application of S with N and other nutrients produced higher yield in 1982 over the previous years both in T. aman and aus rice. The response of rice to added S tended to decrease over the years. The effect of P was more pronounced in stress years while that of S in wet years. The yield of Control, N, NP,K,S,Zn and FYM treated plots tended to maintain a constant level over the years. The availability of P, K and S in soils increased due to long continued application. Results indicated an influence of climate and seasons on the fate of nutrients in the fields and hence the yield.

Keywords: Fertilizer, Soil fertility, Rice yiled

Location: Soil Science Field Laboratory of Bangladesh Agricultural University Farm, Mymensingh

Start Date: 00-00-1978

End Date: 00-00-1993

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility, Fertilizer, Rice

Objectives:

To finding out the effect of continuous fertilization and manuring on the crop yield and soil properties.

Methodology:

The long-term fertilizer experiment was set up at the Soil Science Field Laboratory of Bangladesh Agricultural University Farm, Mymensingh during aus season of 1978. Initially the soil contained 1.25% organic matter, 6.8 P^H, 0.06% total N, 9.0 ppm P and 0.2 me% K. In the begining, the treatment combinations were control, N, P, K, NP, NK, PK, NPK, FYM, and GM. After four years in 1982 the treatments P, K, PK, GM and FYM were replaced by NS, NZn, NSZn, NPKSZn and N+FYM respectively. The treatments were replicated thrice in a randomized complete block design. Fertilizers were applied at a rate of 15t FYM ha^-1 from rotten cowdung, 90 kg N ha^-1 from Urea, 30 kg P ha^-1 as TSP, 30 kg K ha^-1 as MP, 30 kg S ha^-1 as Zypsum, 5 kg Zn ha^-1 as Zinc Oxide. During the period from 1978 to 1993 a total of 1580, 500, 490, 750, 880-1815 and 120 kg ha^-1 N, P, K, S, Ca and Zn respectively have been added to different plots, depending on the treatment combinations. Rainfed rice and pulse have been continuously grown in the field following a rice-rice-pulse cropping pattern since 1978. The yield was recorded after each crop harvest. Soil samples were collected after the harvest of T. aman in 1993.

Source of Information: Bangladesh Journal of Nuclear Agriculture. Vol: 13, pp: 65-70, 1997

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results indicated that long-term intensive chemical fertilizer use and cropping create some fertility problems through soil exhaustion as well as through interactions with other elements. Soil hydrology in different seasons mainly control the availability of nutrients and yield of crops. A starter dose of N with FYM maintained a good soil health without any remarkable yield decline indicating the necessity of applying organic manure with chemical fertilizers.

Knowledge Management: Journal