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| DOI：10.13522/j.cnki.ggps.2019452 |
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| Effects of Different Mulching Methods on Soil Moisture-temperature and Tuber Yield of Potato Cultivars with Different Maturities |
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MA Jiantao, CHEN Yuzhang, CHENG Hongbo, LAN Xuemei, LI Yawei, LI Rui, CHAI Yuwei, CHANG Lei, CHAI Shouxi
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1. Gansu Provincial Key Laboratory of Aridland Crop Science/Gansu Agricultural University College of Agronomy, Lanzhou 730070, China; 2. Gansu Agricultural University College of Bioscience and Technology, Lanzhou 730070, China
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| Abstract: |
| 【Objective】We aimed to deeply investigate the effects of mulching patterns on soil moisture-temperature and tuber yield of potato cultivars with different maturities under semiarid rain-fed ecosystem.【Method】The effects of mulching practices (whole maize straw strips mulching-SM, plastic film mulching-PM, traditional flat-planting -CK)on the soil water and heat status, tuber yield and water use efficiency of potato in local typical cultivars of early maturing (EMC, LK99), medium maturing (MMC, Kexin 1) and late maturing (LMC, Qingshu 9) were studied by open field experiments.【Result】Compared with CK, both SM and PM treatments significantly reduced the water consumption of all cultivars of potato during the whole growth stage by 11.0%～19.0%, and the soil water storage capacity of SM and PM increased on average by 24.6, 29.5 and 48.9 mm from the EMC, MMC and LMC, respectively, and there was no significant difference in soil water storage capacity between SM and PM in the same potato cultivar. Compared with CK, The average soil temperature with PM treatment of 5～25 cm soil layer during the whole growth stage of EMC, MMC and LMC was 1.6, 1.6 and 1.4 ℃higher, while the average soil temperature with SM was slightly (P>0.05) lower than that of CK in all potato cultivars. SM and PM significantly increased the fresh weight of single tuber and commodity rate in all potato cultivars, and thus the drying tuber yield of all potato cultivars and water use efficiency (WUED) were 21.6%～51.4% and 44.2%～77.1% higher than that of CK, respectively. The tuber yield and WUED of SM were similar to those of PM in EMC and LMC, but in MMC, both tuber yield and WUED of SM were significantly lower than those of PM.【Conclusion】Based on factors such as potato cultivar maturity, soil thermal-moisture utilization and tuber yield of potato, SM is a kind of clean production mode with high-yield and high-efficiency. It can significantly improve potato yield and water use efficiency. However, in order to obtain higher yield and water use efficiency in dryland area, a scientific combination of different potato cultivars maturities and mulching pattern is needed. |
| Key words: whole maize straw strips mulching; plastic film mulching; potato; soil moisture-temperature; tuber yield |
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