| Effect of film mulching on productivity and interspecific interaction in maize\|pea intercropping system |
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| DOI：10.7606/j.issn.1000-7601.2020.02.23 |
| Key Words: mulching intercropping maize with pea yield land equivalent ratio interspecific competition |
| Author Name | Affiliation | | ZHAO Jianhua | Institute of Soil Fertilizer and Water\|Saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | SUN Jianhao | Institute of Soil Fertilizer and Water\|Saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | LI Weiqi | Institute of Soil Fertilizer and Water\|Saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field experiment was conducted in Hexi Corridor irrigation area of Gansu in 2012 and 2013, with 8 planting patterns including sole pea without mulching (P), sole pea with mulching (FP), sole maize without mulching (M), sole pea with mulching (FM), maize intercropped with pea without mulching (M/P), maize with mulching intercropped with pea without mulching (FM/P), maize without mulching intercropped with pea with mulching (M/FP), and maize with mulching intercropped with pea with mulching (FM/FP). The productivity and interspecific interaction in maize\|pea intercropping system were evaluated based on grain yield, yield component factor, LER and indexes of interspecific interaction, such as relative yield of mixtures (RYM), relative competition intensity (RCI), aggressivity (A) to clarify the effects of film\|mulching planting in intercropping system on productivity and interspecific interaction. The results showed that the land equivalent ratio (LER) values in all intercropping patterns were greater than 1.00, and the LER values of M/FP and FM/FP were significantly higher than those of M/P and FM/P. There was no significant effect on yield of sole pea. Compared to M/P, the yields of intercropped pea in M/FP and FM/FP were increased by 24.1% and 32.5%, respectively, but the yield of intercropped maize was not significantly affected by film mulching. Compared to M/P, two years’ average weight of FM/P and FM/FP were increased by 35.2% and 35.1%, respectively. Compared to M/FP, they increased by 16.3% and 16.2%, respectively. Compared to M/P, the grain per plant and grain weight per plant of intercropped pea in FM/FP were increased by 43.7% and 60.3%, respectively, and the grain numbers per spike of intercropped maize was not affected by film mulching. Compared to M/P, two years’ average of 100-seeds weight of intercropped maize in FM/P and FM/FP increased by 5.2% and 10.3%, respectively. The relative yield of mixtures (RYM) of all intercropping patterns were greater than 1.0, and the relative competition intensity (RCI) were negative, the relative competition intensity of maize (RCIm) in FM/P and FM/FP were significantly higher than those of M/P and M/FP, the interspecific interaction mainly was intraspecific competition, the aggressivity of pea relative to maize (Apm) were negative, indicating that maize was the greater competitor in maize\|pea intercropping system. Therefore, both intercropped crops with mulching or intercropped maize with mulching in maize\|pea intercropping system efficiently improved yield of intercropped maize and strengthen the competition ability of maize to resource, and increased the intercropping system productivity in Hexi Corridor in Gansu Province. |
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