Crop production and economics under Litchi chinensis Sonn. plantation across 1- to 9-year age series in north Bihar, India

age arroz brassica campestris cash crops cost benefit analysis crop yield cultivo intercalado cultivos comerciales culture de rapport culture intercalaire edad gingembre ginger intercropping jengibre litchi chinensis mais maize oryza sativa plant production plantaciones plantations rendement des cultures rendimiento de cultivos rice riz rotation culturale rotational cropping toria trichosanthes trichosanthes dioica trigo triticum aestivum vigna radiata wheats zea mays zingiber officinale