WAARD, P.W.F. DE, - Foliar Diagnosis, Nutrition and yield Stability of Black Pepper (Piper Nigrum L. [in Sarawak,Borneo]. [First edition].

Amsterdam, KIT, 1969. 8°. Original printed limp wrappers. (xi), 149pp.Some captioned monochrome illustrations on a plate (some species researched), comparative tables, figures, diagrams, graphs in text, extensive bibliography, summaries in Malaries in english, indonesian and dutch, errata leaf loosely inserted, table of contents. [Department of Agrucultural Research The Royal Tropical Society, Communication No. 58]. Still important english language scientific investigation, originally published as a dissertation submitted to Wageningen Agricultural University, researching and investigating of Piper Nigrum L., cultivated in Sarawak, East Malaysia, e.g.: the cultivation of pepper, foliar diagnosis in humid tropical regions, review of literature, analytical methods, the sampling procedure, nurituonal deficiencies and folioar diagnosis, the influence of applications of fertilizer on foliar concentrations of 5 major nutrients..,preceded by a description of Sarawak in general and a preface by which author clarifies his objectives. Very good copy.

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