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N. Swami Rao , Dasappa , C. D. Singh

Abstract

Weeds adversely affect the germination and growth of seedling in the Eucalyptus Hybrid nurery beds. Manual weeding which is generally followed is time consuming, difficult and less effective. In order to overcome this problem a study was undertaken for effective control of weeds in Eucalyptus hybrid nursery by means of pre-emergence weedicides viz.basaline (Profluralin), Pendimethaline (stanp 30 EC), ronster (Oxadiazen) and Simazine. They were applied to nursery beds as pre-emergence spray, at 1.5, 1.5, 1.5 and 1 kg/ha respectively. Basalin was most effctive in controlling both dicot and monocot weeds followed Pendimethaline and Ronster. Simazine was lethal to both Eucalyptus and weed seed germination. Seedling of Eucalyptus in Basaline treated plots were more in number(152/sq ft.) taller (24 cm) and healthier compared to other weedicides treatments. Maximum nunber of dicots and monocot weeds were found in control plots , consequently seedling growth was very much suppressed. The studies indicated that pre- emergence chemical weedicides could be effectively used to control nursery weeds and that basaline weedicides is more effective in controlling both dicots and monocot weeds and appears to be suitable chemical weedicides for Eucalyptus hybrid nurseries.

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N. Swami Rao , P. Chandrashekara Reddy

Abstract

Investigations were carried out to study the effect of Eucalyptus (hybrid) leaf extracts on the germination and other growth parameters of selected dry land food crops. The result revealed that the leaf extracts inhibit germination of crop seeds to a certain extent. Overall growth rate of seedlings was also reduced in all the treatmlnts compared to control. Heavy mortality of the seedlings and reduced vigour under laboratory conditionsi indicated that the accumulation of toxic substances is harmful to the growth of seedlings of crop plants. Reduction in vigour and growth rate in the early stages of growth was observed in the field grown seedlings but their gradual recovery indicated that once the inhibitory substances are leached out from soil the harmful effects are minimised. It may not be possible to grow food crop successfully near Eucalyptus plantation in areas with low rainfall where there always a possibility of accumulation of toxic substances in the soil from the leaf litter.

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