3Donald C M. The breeding of crop ideotypes.Euphytica [ J ]. 1968,17:385 - 403.
4Mock J J, Pearce RB. An ideotype of maize. Euphytica [ J ]. 1975,24:613 - 623.
5Westgate M E, Forcella F ,Reicosky D C, et al. Rapid canopy closure for maize production in the northern U S corn belt; radiation-use efficiency and grain yield [ J ]. Field Crop Research,1997,49(2-3):249 - 258.
8Ahmadzadeh N W. Evaluation of upright leaves, sucrose and glutamate on yield of corn Agro. A6-stracts, 1970, 51 : 451 - 457.
9Crosbie D N. Photosynthesis and crop production. Advances in Agro., 1971,23:317 - 336.
10Facorede J W. Field investigations of the relationships of leaf angles in corn to grain yield and a- parent photosynthesis [ J ]. Agro. J., 1968, 60:422 - 424.
