D. J. Mead , A. Zaidi , K. Chakrabarti

Abstract

For container-growing both Cryptomeria japonica and Pinus patula seedlings it is recommended to mix 300 g of ammonium sulphate, plus 1,300 g super phosphate plus 400 g sulphate of potash to each m^{3 of soil-less potting mix. An additional 4 mg Nand 1 mg K per seedling should be applied every two weeks. Alternatively a slow-release, complete fertiliser could be used. This recommendation stems from N, P, K factorial experiments using 150 ml ischolar_main trainers, which clearly showed applying only one of the three nutrients by itself elicited almost no response and applying any combination of two, an intermediate response. Applying N+P+K produced 86% and 155% responses in height over the control; for C. japonica and P. patula, respectively. Applying a substantially higher rate of N, P, K increased growth by only a further 10%. The N+P+K fertiliser treatments produced satisfactory planting stock in 6 months.}

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M. D. Mehrotra , P. C. Pandey , K. Chakrabarti , Suresh Sharma , K. Hazra

Abstract

Root-rot of Acacia mangium by Ganoderma lucidum and heart rots by Phellinus pachyphloeus and Trametes palustris have been recorded from plantations raised in West Bengal. The exotic appears to be highly susceptible to Ganoderma ischolar_main-rot which is quite prevalent in Midnapore Forest Division. Heavy mortality in 1985 plantation is viewed with concern by the State Forest Department. Effective measures to keep the disease in check have been outlined. Heart rots caused by Phellinus pachyphloeus and Trametes palustris are the first records of decay in standing trees of A. mangium in India. Though decay, at present, is not a serious problem it is likely to be highly damaging in older stands in view of the progressive nature of decay. Preventive measures for heart rots are recommended.

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