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Nutrient Uptake by BRRI Dhan28 as Influenced by Different Forms and Doses of Urea

I. Miah
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

M.A.H. Chowdhury
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

R. Sultana
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

I. Ahmed
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

B.K. Saha
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

A field experiment was conducted at the Bangladesh Agricultural Development Corporation (BADC) Farm, Baradi, Meherpur during the period from January 2012 to May 2012 to find out the effects of prilled urea (PU) and urea super granule (USG) on nutrient contents of boro rice cv. BRRI dhan28. The experiment was arranged in a randomized complete block design (RCBD) with three replications. There were ten treatment combinations consisting of two forms of urea viz., PU and USG and five levels of each form (0, 110, 180, 240 and 300 kg ha^-1). Besides, TSP, MOP, gypsum and zinc sulphate were applied @ 100, 70, 60 and 5 kg ha^-1, respectively as basal dose. The contents of N, K, S and Ca in grain and N, P, S, Ca and Mg in straw were influenced significantly due to different treatments. The uptakes of N, P, K, S, Ca and Mg in grain and N, P, S, Ca and Mg in straw were expressively affected due to different treatments. USG240 and PU300 treatments showed the best performance for nutrient content and their uptake where the highest values were found in USG300. A positive and significant correlation was found between N and other nutrients in grain. The results suggest that urea super granule @ 240 kg ha^-1 may be suitable for better quality of boro rice cv. BRRI dhan28 in the agroclimatic condition of the study area.

Keywords: Prilled urea, Urea super granule and nutrient uptake

Location: Bangladesh Agricultural Development Corporation (BADC) Farm, Baradi, Meherpur

Start Date: 00-01-2012

End Date: 00-05-2012

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1. To investigate the effects of different forms of urea on the nutrient contents and uptake by boro rice cv. BRRI dhan28.

Methodology:

The experiment was carried out at Bangladesh Agricultural Development Corporation (BADC) Farm, Baradi, Meherpur during boro season of 2012 (January to May). BRRI dhan28 was used as test crop. The experimental field belongs to calcareous Dark Grey Floodplain soil and it was a medium high land of silty loam soils having pH 6.4, 1.10% organic matter, 0.102% total N, 27.0 µg g^-1 soil available P, 18.0 µg g^-1 soil available S and 0.026 me 100 g^-1 soil exchangeable K. The experiment was laid out in a randomized complete block design (RCBD) with three replications. There were ten treatment combinations consisting of two forms of urea viz., PU and USG and five levels of each form (0, 110, 180, 240 and 300 kg ha^-1). Besides, TSP, MOP, gypsum and zinc sulphate were applied @ 100, 70, 60 and 5 kg ha^-1, respectively as basal dose. Seeds of BRRI dhan28 were collected from BADC Seed Production Farm, Baradi, Meherpur. The collected seeds were sprouted by soaking in distilled water for 48 hours and seedlings were raised in wet nursery bed. Thirty five days old seedlings were uprooted from the seedbed very carefully and were transplanted in the experimental plots on 26 January, 2012. Two seedlings hill-l was planted maintaining hill spacing of 20 cm and row spacing of 20 cm. Intercultural operations were done as and when necessary. The crop was harvested on 10 May, 2012. Rice grain was chemically analyzed for the determination of total N, P, K, S, Ca and Mg. Total nitrogen was determined by semi-micro kjeldahl method and Phosphorus by SnCl₂ method. Potassium was determined by flame photometer method and sulphur by turbidimetric method. Calcium and Magnesium were determined by complexometric method of titration. The nutrient uptake was calculated by using the formula Nutrient uptake (kg ha^-1) = [{Minerals constituent (%) × dry matter weight (kgha^-1)} ÷ 100]. Data were analyzed with the help of MSTAT-C. Mean differences adjusted by least significance difference (LSD) test.

Source of Information: J. Agrofor. Environ. 6 (1): 129-133, 2012; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Slow release N fertilizers have increasing demand due to their better nutrient use efficiency than traditional N fertilizers. Present experiment showed that USG and PU affect both nutrient content and nutrient uptake in BRRI dhan28, though the effects were not similar in both forms of fertilizer and in all doses. The doses of fertilizer found to affect more than the forms of fertilizer in the case of nutrient content and nutrient uptake in BRRI dhan28, especially in case of N, P, K and S content and their uptake. Among the doses used in the experiment USG @ 300kg ha^-1 showed better performance in the case of N, P, K, S and Ca content, which in the most cases were statistically identical with USG240 and PU300 . In the case of nutrient uptake, in most cases, USG240 found better. From the a above discussion, it may be concluded that USG240 and PU300 treatments showed the best performance for nutrient content and their uptake on boro rice cv. BRRI dhan28. The results also suggest that urea super granule @ 240 kg ha^-1 may be suitable for better growth, yield and quality of boro rice in the agroclimatic condition of the study area.

Knowledge Management: Journal