Author(s):

Supriya BV, Medda PS and Rakesh S

Abstract: The experiment was conducted during the year 2017-18 at the instructional farm of Department of Plantation Crops and Processing, Faculty of Horticulture, Uttar Banga Krishi Vishwavidyalaya, West Bengal. The study was aimed to evaluate the effect of graded level application of boron and potassium and their interaction on potassium content in soil, leaf and nut (mg/kg) and their interaction effect on yield parameter in the potassium deficient soils of terai region of West Bengal. The experiment was carried out in a 2.7×2.7 m spaced 12 year old planted with cv. Mohitnagar and laid out in factorial RBD having 12 treatments replicated 4 times with 4 different level of boron viz B₀, B₁, B₂ and B₃ at 0g, 25g, 50g and sprayed with 4% Na₂B₄O₇ solution along with 3 different level of potassium ( K₂O) viz K₁, K₂ and K₃ at 70 g, 140 g, 210 g of K₂O per palm respectively to the bunches at 2^nd, 4^th and 6^th months respectively per palm at nut development stage at regular intervals. Soil and nut samples are collected from 10 equidistant spots and 10 different palms respectively where as leaf sample is collected from the 4^th index leaf (Ravi Bhat and Sujatha 2014) from 10 equidistant palms for analysis before and after application of treatments. The results revealed that graded level application of boron and potassium shows that at higher level of boron(B₂) shows increased potassium content in the soil and nut where as at (B1) the potassium content of the leaf showed highest and at (K3) the potassium content of the soil and nut showed highest potassium and at K2 level the potassium content of leaf is gradually increased (mg/kg) and their interaction effect shows that, higher level combination of both boron and potassium(B₂K₃) shows higher potassium content in the soil and nut(mg/kg) and also 0 level of boron and highest level of potassium showed increase3d potassium content in the leaf(B₀K₃) and aslo at B₃K₂ and B₂K₂ level of interaction the yield parameters like (fresh kernel weight and dry kernel weight) shows significant effect.

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