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Study on quality index of high yield colony of different plant types of corn

SONG Bi 1, WU Sheng li 1, SU Luan bing, LIU De feng 3, LI Ye 4 (1 Department of Agronomy,Agricultural College, Guizhou University, Guiyang 550025,China;2.Agricultural Bureau of Bijie, Bijie 551700,China;3.Agricultural Bureau of Dafang, Dafang 551  
In the special ecological condition of mountain area of north west Guizhou. Using split plot design, the quality indexes of colony of three different plant types maize were studied. The results show that the best density of the high yield colony structures of compact 3638 is 4 100 - 4 900 plants per 66 7 m 2. The main quality indexes of 3638 are maximum LAI(3-4),dry matter accumulation ( 1 400 - 1 420 kg·667 m -2 ),total LAD(14-18 10 4 m -2 ·d·667m -2 ),NAR(6 2-7 3g·m -2 .d -1 ),utilization rate of light energy (1.47%-1.50%),economic coefficient (0.57-0.58).The best density of the semi compact S 9914 is 4 100 - 4 900 plants per 667m 2. The main quality indexes of S 9914 are maximum LAI (3 9-4 4), dry matter accumulation (1 380 kg·667 m -2 ), total LAD (20-22 10 4 m 2·d·667·m -2 ),NAR(4 7-5 3 g·m -2 ·d -1 ), utilization rate of light energy (1 11%-1 15%),economic coefficient(0 44-0 50). The best density of the plate Bidan 4 is about 4 100 plants per 667 m 2. The main quality indexes of Bidan 4 are maximum LAI (5 2),dry matter accumulation (1 300-1 350 kg·667 m -2 ), total LAD (26 10 4m 2·d·667m -2 ),NAR (4 8 g·m -2 ·d -1 , utilization rate of light energy (1 15%), economic coefficient (0 44)
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