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Effect of Nitrogen and Potassium on the Root Growth, Nutrient Content and Yield of Mungbean (vigna Radiata L. Wilczek) Under Waterlogged Condition

M. R. Amin
On-Farm Research Division. Bangladesh Agricultural Research Institute, Gazipur-1701

M. A. Karim
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman University, Gazipur-1706

Q. A. Khaliq
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman University, Gazipur-1706

M. R. Islam
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman University, Gazipur-1706

S. Aktar
Pulse Research sub-station, BangLadesh Agricultural Research Institute, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted with mungbean genotype IPSA-13 in the field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during September, 2012 to November, 2012 to study the root growth, nutrient concentration and seed yield of mungbean as influenced by N and K under waterlogged conditions. Nutrient supply in the soil had significant impact on better recovery in root development of 4-day waterlogged plants. Development of adventitious roots was one of the adaptive responses of IPSA-13 mungbean genotype. Root length was decreased due to the anaerobic condition. Plants waterlogged for 4-days allocated more dry matter in adventitious root development and hence root volume was higher in waterlogged plants. Root volume in flooded plants increased due to the development of adventitious roots. Root dry weight increased with combined application of N and K fertilizers. Flooded plants treated with 14 kg N ha^-1 + 25 kg K ha^-1 produced the highest TDM and seed yield, though the yield was statistically similar to that obtained when the levels of N and K were applied separately, as well as with that of 1 % urea + 25 kg K ha^-1.

Keywords: Nitrogen and potassium, Root growth, Nutrient content, Soil moisture, Mungbean

Location: Agronomy Research field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh.

Start Date: 00-09-2012

End Date: 00-11-2012

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer, Mungbean

Objectives:

To observe the root growth, nutrient uptake potentials and yield performance of waterlogged mungbean receiving variable doses of applied N and K fertilizers.

Methodology:

The study was conducted at the Agronomy Research field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh during September, 2012 to November, 2012. The soil of the experimental plots was silty clay of shallow Red Brown Terrace soil belongs to 'Salna' soil series under Madhupur Tract (AEZ 28). The experiment was carried out with mungbean genotype IPSA-13. The experiment was set up in a randomized complete block design with four replications, Five treatments were: (i) T₁= Control (4-day waterlogged but not fertilized after termination of waterlogging) (ii) T₂= 4-day waterlogged and received 14 kg N ha^-1 broadcasted after termination of waterlogging (iii) T₃= 4-day waterlogged and received 25 kg K ha broadcasted after termination of waterlogging (iv) T₄= 4-day waterlogged and received 14 kg N ha + 25 kg K ha broadcasted after termination of waterlogging (v) T₅ = 4-day waterlogged + foliar spray with 1 % urea solution after termination of waterlogging + 25 kg K ha broadcasted after termination of waterlogging. The size of each plot was (2m x 2m) = 4 m². Seeds of mungbean were sown maintaining a spacing of 30 cm x 10 cm. At the border of each plot, one additional row of mungbean was grown to avoid border effect. When the seedlings became 24 days old, water logging with 3-5 cm of standing water was maintained continuously above the soil surface for 4 days (96 hours) during 24-27 days after emergence and thereafter standing water was removed. Fertilizer treatments were applied as broadcast in the form of urea and muriate of potash and 1 % urea solution was sprayed on the foliage of the plants following the termination of water logging. Drain in between two waterlogged plots was 1.5 m so that water could not soak to the neighboring plots. Five plants were harvested from 4-day waterlogged control and waterlogged fertilized plots for data collection. Data were collected after termination of 4-day water logging beginning from 28^th days after emergence and thereafter each 10 days interval. At each sampling required data viz. root length, root volume, root dry weight, total dry matter, days to first 50% flowering and maturity was recorded. The plants harvested at maturity and yield parameters were recorded. The data on different parameters were subjected to statistical analysis. Microsoft EXCEL and MSTAT-C software programs were used wherever appropriate to perform statistical analysis. All recorded data were analyzed using analysis of variance (ANOV A) and means were compared using Least Significant Difference (LSD) test according to Gomez and Gomez.

Source of Information: The Agriculturists 13(1): 67-78(2015), ISSN 2304-7321 (Online), ISSN 1729-5211 (Print)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The treatment ,T₄ (4-day waterlogged and received 14 kg N ha^-1 + 25 kg K ha^-1) enhanced root growth and had higher N concentration but treatment T₃ (4-day waterlogged and received 25 kg K ha^-1) had higher K concentration of the plants after removal of water logging. Waterlogged plants when treated with combined application of N and K (T₄) produced maximum root dry weight, total dry matter and seed yield of mungbean. Additional application of nitrogen and potassium @ 14 kg N ha^-1 and 25 kg K ha^-1, respectively separately or in combination, and 1 % urea + 25 kg K ha^-1 after termination of flooding, was found to mitigate water logging damage of the genotype IPSA-l3. Therefore, N and K should be applied when stagnant water recedes from mungbean field.

Knowledge Management: Journal