Effects of Straw Mulching on Maize Growth,Photosynthesis and Yield

doi:10.7668/hbnxb.2015.04.030

Abstract

Abstract: To clarify the suitable quantity of straw mulching for maize production in Huaibei area,an experiment with different straw mulching levels M0(0 kg/ha),M1(3 000 kg/ha),M2(6 000 kg/ha),M3(9 000 kg/ha),M4(12 000 kg/ha),M5(15 000 kg/ha) and M6(18 000 kg/ha) was conducted to study the effects of straw mulching on maize growth,photosynthesis and yield.The results showed that the internode length and plant height of maize presented a change trend of first increased and then decreased with increasing straw mulching levels,and M4 had the highest values.The suitable straw mulching quantity significantly increased chlorophyll density and green leaf area per plant of maize,but when the straw mulching level increased to a certain extent the difference in effect of straw mulching between different straw mulching quantity was no longer obvious.The population dry matter weight of maize was also obviously affected by straw mulching,and M4 had the highest values,when compared to M0 and M6,the population dry matter weight was increased by 24.6%,17.2%,13.7%,8.6% and 2.0%,2.3%,1.9%,0.8% respectively at big trumpet stage,silking stage,middle of filling stage and maturity stage.The chlorophyll fluorescence parameter of maize was also obviously affected by straw mulching,the chlorophyll fluorescence parameter of Fm,Fv/Fm,Φ_psⅡ and ETR of M4 was significant higher than that of M0,while Fo was significant lower than that of M0.The yield of maize had a change trend of first increased and then decreased with increasing straw mulching levels,and the yield of M4 (10 186.8 kg/ha) was the highest,M0 (9 365.1 kg/ha) was the lowest.Correlation analysis revealed that the chlorophyll density,green leaf area per plant,population dry matter weight,and actual photochemical efficiency were all significantly positively correlated to yield with the shape of a straight line.All the findings revealed that the suitable straw mulching quantity for maize in Huaibei area was 12 000 kg/ha,while there will be some bad effects on increasing yield when the straw mulching quantity was too high or too low.

Key words: Chlorophyll density, Green leaf area per plant, Chlorophyll fluorescence, Yield

CLC Number:

S513.011

ZHANG Xiang-qian, QIAN Yi-liang. Effects of Straw Mulching on Maize Growth,Photosynthesis and Yield[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(4): 174-180. doi: 10.7668/hbnxb.2015.04.030.

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