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Effects of Npks on Yield and Nutrition of BRRI Dhan49

Kamrunnahar
Department of Botany, Jagannath University, Dhaka 1100, Bangladesh

S Ahmad
Department of Botany, Jagannath University, Dhaka 1100, Bangladesh

M Iqbal
Soil Science Division, BRRI, Gazipur 1701, Bangladesh

M N Islam
Soil Science Division, BRRI, Gazipur 1701, Bangladesh

A Islam
Soil Science Division, BRRI, Gazipur 1701, Bangladesh

Abstract/ Executive Summary:

Nitrogen (N), phosphorus (P), potassium (K) and sulphur (S) strongly influence rice plant nutrition. Present experiment was conducted at the Bangladesh Rice Research Institute (BRRI) farm, Gazipur in a permanent layout in wet season of 2014. Objectives of the research were to study the effects of NPKS on grain yield, plant nutrition, requirement of NPKS to produce one ton grain and to estimate the indigenous nutrient supply of the soil. BRRI dhan49 was tested with NPKS (complete), PKS (-N), NKS (-P), NPS (-K) and NPK (-S) fertilizer packages. The NPKS were applied @ 100-7-80-3 kg ha^-1. Omission of each nutrient from the complete treatments significantly reduced grain and straw yields of BRRI dhan49. The highest yield reduction was recorded because of N omission followed by K. Nutrient concentration in grain and straw as well as nutrient uptakes were significantly affected by major plant nutrients. Nutrient uptake was directly related to the biomass production. About 87% of total K uptake remained in straw and thus a good K source for rice cultivation. Nitrogen, P, K, S and Zn required to produce one ton rice were 20.88, 5.04, 18.77, 2.08 and 0.07 kg, respectively. The indigenous N, P, K and S supply capacity of this soil was 37, 13, 41 and 6 kg ha^-1, respectively.

Keywords: Rice, Nutrient uptake, Indigenous nutrient, Straw

Location: BRRI farm, Gazipur,

Start Date: 15-06-2014

End Date: 21-07-2014

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine the Effects of NPKS on Yield and Nutrition of BRRI dhan49

Methodology:

Soil, crop, experimental design and treatments: An experiment was conducted in the research field of BRRI farm, Gazipur in a permanent layout first designed in Boro 1985. Initial soil of the experimental field was clay loam in texture having pH, 5.70, 1.14% organic carbon, 0.08% total N, 9.80 ppm available P, 70 mg kg^-1 exchangeable K, 9.00 ppm available S and 3.30 ppm available Zn. In T. Aman 2014, BRRI dhan49 was tested with five fertilizer treatments: NPKS (complete), PKS (-N), NKS (-P), NPS (-K) and NPK (-S). NPKS @ 100-7-80-3 kg ha^-1. Dates of sowing and transplanting were 15 June 2014 and 21 July 2014, respectively. The experimental design was randomized complete block with three replications. One- third of N as urea and the whole amount of P as triple super phosphate, K as muriate of potash and S as gypsum were applied at the final land preparation. The remaining two-third N was applied in two equal installments at 25-30 days after transplanting (DAT) and seven days before panicle initiation stage (PI stage). Two rice seedlings (36-day-old) were transplanted at 20 × 20 cm spacing under irrigated condition. Appropriate cultural and management practices including plant protection measures were followed during growing season. All plots were surrounded by 30 cm soil levees to avoid contamination between plots. Grain yield: The crops were harvested at maturity from 2.5 × 2 m area at 15 cm above ground level for grain yield calculation. Straw yields were recorded from 16-hill sample harvested at the ground level from four corners and dry matter yield was calculated. Both straw and grain samples were digested using HNO₃-HClO₄ (5:2) di acid mixture. Phosphorus and S were determined colorimetrically with spectrophotometer (Model: V-630, Jasco). Potassium was determined by flame photometer (Model 410, Sherwood) and Zn by atomic absorption spectrophotometer (Model: 170-30, HITACHI). All data were analyzed statistically using CropStat software version 7.2.

Source of Information: Bangladesh Rice J. 20 (2) : 39-47, 2016

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Major plant nutrients significantly affected the yield, nutrient concentration and uptake of T. Aman rice (BRRI dhan49). Major portion of absorbed K remain in rice straw. So, rice straw should be recycled in the field for K source. The indigenous N, P, K and S supply capacity of this soil was 37, 13, 41 and 6 kg ha^-1, respectively. A good recovery of applied nutrients was also observed in this soil.

Knowledge Management: Journal