EFFECT OF MICRONUTRIENTS ON PHYSIOLOGY OF GROWTH, NODULATION, NUTRIENT UPTAKE AND YIELD IN BLACKGRAM (Vigna mungo (L.) Hepper)
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
A field experiment was carried out at the College Farm, Agricultural College, Bapatla in clay loam soil during rabi 2017-18 to study the “Effects of Micronutrients on Physiology of Growth, Nodulation, Nutrient uptake and Yield in Blackgram (Vigna mungo (L.)Hepper)”.The experiment was laid out in randomized block design with eight treatments of micronutrient application viz., control (T1), Borax @ 2.5 Kg ha-1 (T2), Ammonium molybdate @1.5 Kg ha-1 (T3), Ni Cl2. 6H2O @ 1.0 Kg ha-1 (T4), Borax @ 2.5 kg + Ammonium molybdate @ 1.5 Kg ha-1 (T5), Borax @ 2.5 kg + Ni Cl2. 6H2O @1.0 Kg ha-1 (T6), Ammonium molybdate @ 1.5Kg + Ni Cl2. 6H2O @ 1.0 Kg ha-1 (T7) and Borax @ 2.5 Kg + Ammonium molybdate @ 1.5 Kg + Ni Cl2.6H2O @ 1.0 Kg ha-1(T8) in three replications.
Significant increase in plant height (13.7-28.7 %) was observed with Mo, B+Ni, Mo+Ni, B+Mo and B+Mo+Ni application and branch number (19.0 to 50.8 %) was obtained in combination treatments. Leaf area, nodule number and nodule weight plant-1 found increased with B, Mo and combination treatments T5 to T8.
RWC of leaves increased significantly with application of micronutrients in combination. Root and pod biomass increased by Mo alone and combination treatments. Biomass of leaf and total plant increased by both individual and combination treatments.
Application of B, Mo and Ni individually and in combination increased the CGR and RGR. Increase in NAR was observed with T3 and T5 to T8. Total chlorophyll, chlorophyll ‘a’ and chlorophyll ‘b’ content increased only in combination treatments, while carotenoids found increased in T2, T4 and T5 to T8.
Increase in internal CO2 concentration and decrease in transpiration rate was obtained with all treatments T2 to T8, but stomatal conductance and photosynthetic rate responded positively with treatments T5 to T8.
Leghaemoglobin content in nodules, activity of urease in leaves and nodules and protein content in seed increased with B, Mo and Ni application individually and in combination. Activity of NR in leaves increased with T2 to T8 except Ni (T4) application alone. All combination treatments increased the NPK content and uptake in plant and seed to a greater extent than individual application.
Earliness in 50 per cent flowering, 50 per cent pod maturity and increase in pod number plant-1 and pod length was obtained in treatments T2 to T8. Flower number plant-1 and pod weight increased with T3 and T5 to T8. Seed number pod-1 increased only in combination treatments. Test weight was not influenced by B, Mo and Ni nutrition.
The increase in seed yield over control (1257.1 kg ha-1) was high in combination of three nutrients (2144.5 kg ha-1) and B+Mo application (1973.0 kg ha-1). B and Mo individual application also increased the yield by 1.1 and 1.2 folds respectively. Ni application alone had no influence on yield.
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D5629
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