关键词: 叶倾角, 叶日积, 群体密度, 群体结构

Abstract: Colony structural characteristics of crops on high-yield fields are analysed in this paper. For wheat with intensive farming, the maximum tillering number is 12×10⁶/ha, maximum LAIis 5.5-6.0 and ear number is 4.5-5.25×10⁶/ha, but for that with traditional farming, they are respectively 15-18×10⁶/ha, 6.0-6.5 and 6.0-7.5×10⁶/ha. The LADratio of vegetative to reproductive growth is 1:0.89 on high-yield field with intensive farming, and 1:0.73 with traditional one. The planted density of summer corn is mainly decided by its leaf inclination. The arreet type of corn has an inclination of larger than 65°, and its planting density is 7.5-8.25×10⁴/ha. That of lanceolate type is less than 50°, whose planting density is 5.25-6.0×10⁴/ha.

Key words: Leaf inclination, Leaf area day(LAD), Colony density, Colony structure