Provisional yield tables of hybrid poplars in Pakistan
Provisional yield tables of hybrid poplars in Pakistan
Raja Walayat Hussain and Mahmood Iqbal Sheikh
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'x 6', 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'x10' spacing gives MAI of 400cft or more,
with 15'x15'and 18'x18' MAI is 200cft to 320cft per
acre.
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December 1981
Vol. 31, Iss. 4
