苹果幼树优质丰产开发的关键技术１９９０～１９９３年，山东省组织开展了近６．７万公顷苹果幼树优质丰产技术开发的研究，取得了平均每公顷产量１５１５０公斤、优等果率高达８３．９％的巨大成果，探索出一整套“养根壮树、控势促花、合理负荷、提高质量”的栽培新技术... Key techniques for developing high quality and high yielding apple seedlings From 1990 to 1993, Shandong Province organized the research on the development of high yield and high yield technology of nearly 67,000 hectares of young apple trees. The average yield of 151,500 kg per hectare and the excellent fruit rate reached 83. 9% of the great achievements, to explore a set of “rooted tree, control flower, reasonable load, improve quality” cultivation of new technologies ...