Effects of herbaceous vegetation removal on the soil moisture and on the initial growth of a monoclonal plantation of Eucalyptus 12 ABL x Saligna
1995
N'zala, D. (Marien Ngouabi Univ., Brazzaville (Congo). Lab. de Protection des Vegetaux et d'Ecologie appliquee) | Dembi, J.F. | Loumeto, J.J.
A trial has been carried out in Congolese coastal savanna in order to determine the distance to which herbaceous vegetation should be removed around young Eucalyptus 12 ABL x saligna. Eucalyptus were planted within weeded circles of variable radius : 0,35, 70, 105, 140 and 175 cm. Eight months after planting, the herbaceous vegetation did not have a negative sensible effect on the revival of the Eucalyptus. Twenty seven months after planting the rate of survival was still high. It accounted for about 59 percent and superior to 78 percent in the proof and other treatments respectively. The observations made on the vigor and the growth has shown that plants within circles of 0 and 35 cm radius were competed with spontaneous vegetation. Weedings within circles of 70 and 105 cm of radius were sufficient to preserve enough soil moisture and therefore to ensure the survival and to increase in very important proportions the growth of young Eucalyptus. A radius higher than 105 cm has not shown any significant advantage. It has been found that plantation watering mainly during dry season was capital to help plant juvenile growth.
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