Physiological Characteristics of Population and Its Response to Density in High-yield Silage Maize

doi:10.7668/hbnxb.20190064

Abstract

Abstract: Dajingjiu 26, a high yield and widely adaptive silage maize hybrid, was used as material to study the effects of different densities on the physiological characteristics and agronomic characters of high-yield population of silage maize in the West Liao-river Plain of Inner Mongolia, and six density levels were designed, i.e. 52 500, 60 000, 67 500, 75 000, 82 500 and 90 000 plants/ha, and the response of physiological characteristics and agronomic characters of high-yield population exceeding yield of 21 000 kg/ha to density was studied. The results showed that the biological yield of silage maize increased with the increase of planting density. The treatment of exceeding yield of 21 000 kg/ha were 67 500 and 75 000 plants/ha, reaching 21 751.1 and 22 551.1 kg/ha respectively. The yield of 52 500 plants/ha treatment was lowest, and the yield of 75 000 plants/ha treatment was 30.4% higher than that of 52 500 plants/ha treatment, reaching an extremely significant level. The population leaf area index of different planting densities presented reached the maximum value at silking stage. The two treatments of 67 500 and 75 000 plants/ha were highest as 5.19 and 5.32 respectively, retaining 3.68 and 3.85 at silage harvest stage. The photosynthetic potential increased with the increase of planting density, which was a positive effect, and the total photosynthetic potential was 326.51×10⁴-384.37×10⁴ (m²·d)/ha. The photosynthetic productivity of maize decreased with the increase of planting density, and the average photosynthetic productivity ranged from 6.50 to 7.64 g/(m²·d); The influence of planting density on the agronomic trait were in turn as follows:the fresh weight of single plant (17.6%), dry weight of single plant (15.5%), ear height (4.7%), staying green (3.0%), plant moisture content (2.1%), stem diameter (1.9%) and plant height (1.8%). The best planting density of silage maize exceeding yield of 21 000 kg/ha was 75 000 plants/ha.

Key words: Silage maize, Density level, Biological yield, Physiological characteristics

CLC Number:

S513.01

SU Tianzeng, HOU Lexin, ZHANG Yuqiang, WANG Fangming, PENG Lei. Physiological Characteristics of Population and Its Response to Density in High-yield Silage Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(2): 132-137. doi: 10.7668/hbnxb.20190064.

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