Canopy Light Distribution and Humidity Analysis of Different Maize Varieties

doi:10.7668/hbnxb.20191147

Abstract

Abstract: To elucidate the difference of light and humidity distribution at different heights in the canopy between suitable for harvesting and common maize cultivars, a field experiment with two maize cultivars(Zhengdan 958, the common cultivar; Lishou 1, suitable for harvesting cultivar) and four planting densities(45 000,60 000,75 000,90 000 plants/ha) were conducted in a randomized block arrangement. The canopy transmittance and relative humidity at different heights of canopy, dry matter accumulation, leaf area index, empty stalk rate and grain yield were analyzed. Results showed that the relative humidity of canopy bottom and panicle level of two cultivars increased with planting density, and Lishou 1 was lower than Zhengdan 958. The leaf area index of Lishou 1 was lower than Zhengdan 958 and comprehensibly the light transmittance was higher than that of Zhengdan 958 at each planting density. There was no significant difference of dry matter accumulation between two varieties at different levels before the middle of filling stage. The accumulation of dry matter for Lishou 1 was significantly lower than Zhengdan 958, but the redistribution of dry matter was higher at maturity. Lishou 1 had a low empty stalk rate and high yield at high-density(90 000 plants/ha). Therefore, Lishou 1, suitable for machine-harvested corn variety, shows advantages in reasonable canopy light distribution, good microenvironment and smooth material production transshipment. Moreover, individual plant can make full use of limited resources with density increase. Lishou 1 can reach high yield with strong density tolerance and low empty stalk rate.

Key words: Summer maize, Canopy humidity, Leaf area index, Dry matter, Yield

CLC Number:

S513

XU Lina, YAN Yan, MEI Peipei, CHEN Shilin, HUANG Shoubing, WANG Pu. Canopy Light Distribution and Humidity Analysis of Different Maize Varieties[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(6): 106-112. doi: 10.7668/hbnxb.20191147.

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