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苹果叶片对根外追~(15)N—尿素的吸收量在处理后的短时间内与时间呈高度直线正相关;叶片夜晚对尿素的吸收明显优于白天.
The uptake of N-urea by root and shoot in apple leaves showed a highly linear positive correlation with time in a short time after treatment. The absorption of urea at night was obviously better than that of daytime.