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Vishamber Joshi , S. P. Joshi , Sumer Chand

Abstract

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S. S. R. Bennet , Sumer Chand

Abstract

Litsea robusta Blume, hitherto known from Burma, Java and Malay Peninsula, is
being reported here for the first time from India, based on a collection from Arunachal Pradesh.

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S. P. Banerjee , Sumer Chand

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In order to quantify and document the influence of forest fire on physico-chemical and moisture characteristics of soil, a study was and undertaken in Sukna I, Kurseong Forest Division, West Bengal. Fire affected the soil by drastic reduction of organic carbon, total nitrogen, cation exchange capacity, exchangeable calcium and magnesium, available P₂O₅ and K₂O. Soil reaction became less acidic. Moisture characteristics of the affected soils were radically changed with substantial reduction in 1/3-bar moisture as well moisture retention at different tensions, and inability to retain any moisture beyond 8.l-bar tension. Water holding and available water capacities were considerably reduced.

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S. P. Banerjee , Sumer Chand

Abstract

A comparison of the methods employing five commonly used extractants for the determination of available-P was made on eleven different types of forest soils. Morgan's 10% CH₃COONa in 3% acetic acid buffered at pH 4.8 was most effective in extracting the highest values of available-P in 19 samples out of 22 under study, followed by Dyer's 1% citric acid extractant. Troug's extractant compared well with the Olsen's but both gave very low values. Bray's 0.03 N-NH₄F and 0.025 N HCl extracted lowest values of available-P in the majority of the samples studied. The results indicate that Morgan's method should be used for the routine estimation of available-P in different types of forest soils.

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