The integration ofAndrographis paniculataunderPinus roxburghii(Chir pine) plantation has been studied to evaluate the growth and yield for its economic viability and conservation. It was grown on three topographical aspects, namely, northern, north-western, and western, at a spacing of 30 cm × 30 cm, followed by three tillage depths, namely, minimum (0 cm), medium (up to 10 cm), and deep (up to 15 cm) tillage. The growth parameters, namely, plant height and number of branches per plant, were recorded as significantly higher on western aspect and lowest on northern aspect except for leaf area index which was found nonsignificant. However under all tillage practices all the growth parameters in both understorey and open conditions were found to be nonsignificant except for plant height which was found to be significantly highest under deep tillage and lowest under minimum tillage. The study of net returns forAndrographis paniculatarevealed that it had positive average annual returns even in understorey conditions which indicate its possible economic viability under integration of Chir pine plantations. Hence net returns can be enhanced by integratingAndrographis paniculataand this silvimedicinal system can be suggested which will help utilizing an unutilized part of land and increase total productivity from such lands besides conservation of theA. paniculata in situ.
INFLUENCES OF DIFFERENT CONCENTRATIONS OF HERBICIDES ON THE GROWTH AND YIELD OF MAIZE AS WELL AS THEIR EFFECTS ON THE ASSOCIATED WEEDS IN NORTH-WESTERN NIGERIA
