光照与苹果果实品质及叶片营养状况苹果是世界四大水果之一。目前，我国苹果种植面积和产量均居世界之首位。据调查，现有苹果种植面积中，７５％以上是近１０年来新栽植的幼树，绝大多数为密植。由于适用于密植果园的栽培技术研究与技术推广滞后，造成大面积果园早期郁闭... Light and apple fruit quality and leaf nutritional status Apple is one of the world’s four major fruits. At present, China’s apple acreage and output rank first in the world. According to the survey, more than 75% of the existing apple planting area is the newly planted saplings in the recent 10 years, with the vast majority densely planted. Due to the cultivation of dense orchards for cultivation of technology research and technology lags behind, resulting in large area orchard early Yu closed ...