Ramanandan, P.L.Muliyar, M.K.2014-07-022014-07-022007-02In: Proceedings, PLACROSYM I, RRII, Kottayam, 20- 23 Mar. 1978. Edited by E. V. Nelliat and others 1979 p-303http://hdl.handle.net/123456789/3599Under the climatic and soil conditions existing at the Central Plantation Crops Research Institute, Kasaragod, regular cultivation and manuring are necessary to increase and maintain the yield at a high level in coconut. Regular cultivation by itself is effective in increasing yields, even in the absence of manuring. Soil samples collected during six consecutive years were analysed for N, P2O5, K2O, CaO and MgO. Cultivation alone as well as cultivation and manuring increased the available P2O5 and K2O in the soil in comparison with the uncultivated and unmanured plot.enArticle