Studies on the design and construction of the Nanjing Guquan rural ecological project IX. Primary report of study on vineyard and earthworm breeding system [China]

aliment pour animaux animal ecology animal production cost benefit analysis crop yield earthworms ecologia animal feeds fertilidad del suelo grapevines huerto frutal lombric lombriz de tierra orchards piensos production animale rendement des cultures rendimiento de cultivos soil fertility verger vid vigne