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Growth and Yield of Rice as Affected by Zinc Fertilization

Md. Khalilur Rahman
Department of Soil, Water and Environment, University of Dhaka , Dhaka-1000 , Bangl adesh

Md. Abdus Sobhan
Department of Soil, Water and Environment, University of Dhaka , Dhaka-1000 , Bangl adesh

Md. Azharul Islam
Department of Soil Science, Nageswari Degree College, Nageswari, Kurigram , Ban gladesh

Syed Monzur Kabir
Department of Soil, Water and Environment, University of Dhaka , Dhaka-1000 , Bangl adesh

Abstract/ Executive Summary:

A pot experiment was carried out to evaluate the necessity of Zinc for the growth and yield of rice (IRRI-11) grown on a loamy soil. Zinc was applied at the rate of O, 2, 4, 8 and 16 kg Zn ha^-1. Two kg Zn ha^-1 treated soil significantly (p=0.05) showed the highest straw and grain yields (10.28 and 9.80 g pot' 1 respectively) and uptake of N, P and K nutrients ( 198, 33 (lnd 238 mg pot 1 respectively) and increased the straw and grain productions over control were recorded as 144 and 149 per cent, respectively by the rice plants. A gradual decrease in growth and yield parameters of rice were observed in doses of 4, 8 and 16 kg Zn ha^-1 compared to 2 kg Zn ha^-1. The results suggest that 2 kg Zn h^-I was sufficient and more effective to promote the growth and yield of rice (IRRI-11)

Keywords: Growth, Yield, Nutrient uptake, Zinc.

Location: Ghatail upazila, Tangail district, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To evaluate the role of Zinc and its appropriate rate need for the better growth and yield of rice (IRRI-11).

Methodology:

The experimental soil (0-15 cm) was taken from Sonatola series under the upazila of Ghatail, district of Tangail. According to USDA Taxonomic classification, the soil belongs to inceptisols order and aquept suborder. The pH value and organic matter (ASA 1965) status of the soil were found to be 6.9 and 1.13%, respectively. The available N and P were 17 and 20.5 mg kg^-1 respectively. Exchangeable K, Ca and Mg were 0.04, 0.35 and 0.30 c mol kg^-1 respectively. The available B, exchangeable Zn and available S were recorded to be 0.2, 4.1 and 24 mg kg^-1 respectively. Two kg of surface soil was taken in each of the bottom sealed plastic pot for pot experiment. Soil in each pot was treated with a basal dose of N (100 kg N ha^-1) as urea, P (90 kg P ha^-1) as TSP and K (80 kg K ha^-1) as MP fertilizers. N was given in each potted soil in three equal splits. Five doses of Zinc (0, 2, 4, 8 & 16 kg Zn ha^-1) as Zinc sulfate (ZnS0₄ .7H₂0) were selected. The amounts of Zinc were uniformly mixed with the soil in the form of aqueous solution. All the treated pots were kept in a net house following a randomized block design with three replications at the premise of Soil, Water and environment Department of Dhaka University. Necessary cultural practices were done as and when required. Two hills consisted of three uniform healthy seedlings were allowed to grow in each pot. Plant height was recorded after 15 days of interval from the date of transplantation of rice seedlings up to 90 days. Tillers were recorded at the maturity of the plant. Grains and shoots were harvested and dry weights were recorded. Plant samples were digested with H₂S0₄ and N, P and K contents were determined by Kjeldahl distillation, colorimetrically and flame photometrically. Least significant difference (LSD) of the treatments and correlation co-efficient between uptake of nutrients and yield of grain were calculated by standard methods.

Source of Information: The CDR Journal, Vol.l, No. 2, December 2006

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Panicles and percent filled grains: Panicles and the percentage of filled grain productions were found to be noticeably modified by the added Zinc fertilizer up to 2 kg Zn ha^-1. Further increase in high dose of Zinc (4, 8 and 16 kg ha^-1) caused the significant reduction of both the panicles and per cent filled grain over 2 kg Zn ha^-1 treated pot for same reasons. The highest number of panicles (10 plants pot 1) and percentage of filled grain (78%) were recorded under the treatment of 2 kg Zn ha^-1. The results showed that the yield of straw and grain of rice increased significantly (p=0.05) with the supply of Zinc up to certain limit like the height, tiller production and other yield components. The highest increments in straw and grain production were recorded to be 10.38 and 9.80 g pot^-1, respectively, where 2 kg Zn ha^-1 was added. The results also revealed that the per cent increment over the control by 2 kg Zn ha^-1, yields of straw and grain were recorded to be 144 and 149% more, respectively. This result is well supported, who also observed the similar significant role of Zinc for the production of higher yield of straw and grain of rice. The results showed a gradual decrease in the straw and grain production along with the further increase in dose of Zinc (i .e. 4, 8 and 16 kg Zn ha^-1) after 2 kg Zn ha^-1 treatment. The highest dose of Zinc (16 kg Zn ha^-1 reduced the yields of straw and grain to a limited extent (7.39 and 6.00 g pot^-1, respectively) and was found to be significantly lower than 2 kg Zn ha^-1 treated pot. This decrease might be due to adverse effect (antagonistic effect with the soil P) of this fertilizer. Reported that grain yield of rice was increased with application of 20 kg Zn ha^-1 but decreased at greater Zn rates. It was noticeable that the necessity of Zinc was proven but only in limited amount in this soil. The reason might be due to the unsystematic application and higher amount of chemical fertilizers , which remain in considerable amount as residual after harvesting of crops.

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