DefinePK

Abstract

ABSTRACT In an earlier study (2) mean annual increment (MAI) of hybrid poplar (P x E Cv 1-- 214) was estimated to be 235cft for a crop of age 6 years with the assumption that 700 trees per acre of the species were available at the above age, that is, planting was dine with a spacing of 10&#39x 6&#39, no thinning was done up to the age of 6 years and only 26 trees were lost on account of mortality and other factors up to this age. This plantation was however not maintained properly, no soil cultivation was done and irrigation was erratic. Since hybrid poplar had been tried in different plantations with varying spacing since 1970, sample plots were laid out to assess its growth performance. Data were available for different spacing in each locality, therefore, the data were considered separately for determination of growth parameters for each locality and for each spacing. Under proper management 6 years old crop with 10&#39x10&#39 spacing gives MAI of 400cft or more, with 15&#39x15&#39and 18&#39x18&#39 MAI is 200cft to 320cft per acre.