Effects of Asystasia intrusa (B1) on early growth of liberica coffee [Coffea liberica; Peninsular Malaysia].
1986
Chong W.S.
Asystasia intrusa (B1) at seed rates of 0, 5, 10 and 15 was introduced into each polybag containing a single coffee plant (Coffea liberica Bull ex Hiern) at its eight-leaf stage. These weeds were allowed to grow and compete with it for a period of six months under normal maintenance in the glasshouse. The coffee plant in the weed-free plot produced 5.7 g of total dry matter, whereas those associated with five weed plants, only 3.5 g/plant was produced. A study was made on growth components of coffee grown in competition with Asystasia. As weed density increased, there was a significant reduction in the height and girth-size of the coffee plant. The number of unfolded leaves and total leaf were production per plant also declined. Dry matter production of coffee was reduced in the following order: leaves > root production of coffee and weeds may be summarized by the linear equation of Y = 5.327 - 1.094X with a regression coefficient of r = -0.88.
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