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Estimation of deciduous forest leaf area index using. It enhances biodiversity and natural biological processes above and below the ground surface, which contribute to increased water and nutrient use efficiency and to improved and sustained crop production. Synthese technique semisdirect sous couverture vegetalevf. Conservation agriculture is a farming system that promotes minimum soil disturbance i. Pdf on jun 1, 2010, tantely razafimbelo and others published. Pdf evolution des problemes malherbologiques a ladoption du. Semis direct pression adventices, maladies et ravageurs. The semi direct method uses a thin metallic needle to count a number of contacts across fresh litter layers. Leau conser vee apres jachere chimique jusqua 80 a 100. This study evaluated one semi direct and three indirect methods for estimating leaf area index lai by comparing these estimates with direct estimates derived from litter collection. Le semisdirect sous couverture vegetale sdcv consiste a associer arret.