Department of Soil Science and Agricultural Chemistry, Bidhan Chandra Krishi Vishwavidyalaya, Mohanpur, 741252, West Bengal
*Corresponding author (Email: kanupran@yahoo.co.in)
1Present address: Department of Agricultural Chemistry and Soil Sciences, College of Horticulture and Forestry, CAU, Pasighat, 791102, Arunachal Pradesh
The critical limit of boron (B) in soils and plants was determined through a pot culture experiment with 22 acidic soils of terai zone of West Bengal. The hot water soluble B in these soils was found to be positively and significantly correlated with pH, organic carbon, and per cent dry matter yield of rice, B concentration in plant tissues and B uptake by shoots. The critical concentration of soil available B and plant tissues B worked out to be 0.32 and 12.5 mg kg 1, respectively below which appreciable responses to B application were observed. The average dry matter yield increased with increasing level of B application up to 1.5 mg kg 1. The response to B application in rice on B-deficient soils was found to be 88.4%.
Boron, Bray's percent yield, critical limits, terai zone, acidic soil, rice
