Effects of residual film and straw mulching on potato yield and soil moisture and temperature in northwest arid land of China
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DOI:10.7606/j.issn.1000-7601.2019.04.27
Key Words: potato  northwest arid land of China, residual film mulching, straw mulching, characteristics of soil temperature and soil water, yield
Author NameAffiliation
LI Hui Lanzhou City CollegeLanzhou, Gansu 730070China
College of Agronomy,Gansu Agricultural University, Gansu Provincial Key Laboratory of Aridland Crop ScienceLanzhou, Gansu 730070China 
CHANG Lei College of Agronomy,Gansu Agricultural University, Gansu Provincial Key Laboratory of Aridland Crop ScienceLanzhou, Gansu 730070China 
HAN Fan-xiang Lanzhou City CollegeLanzhou, Gansu 730070China 
CHENG Hong-bo College of Life Science and TechnologyGansu Agricultural UniversityLanzhou, Gansu 730070China 
CHAI Shou-xi College of Agronomy,Gansu Agricultural University, Gansu Provincial Key Laboratory of Aridland Crop ScienceLanzhou, Gansu 730070China 
LI Bo-wen General Station for Agriculture Technology Extension of Gansu ProvinceLanzhou, Gansu 730020China 
LAN Xue-mei College of Agronomy,Gansu Agricultural University, Gansu Provincial Key Laboratory of Aridland Crop ScienceLanzhou, Gansu 730070China 
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Abstract:
      In order to explore the characteristics of soil temperature and moistureof potato field and yield increasing mechanism under residual film and straw mulching, an experiment was carried out from April to October in 2015. Five treatments were triplicated including residual film direct seeding (T1), small ridge mulching straw and big ridge removed film of no rotary tillage planting (T2), small ridge mulching straw and big ridge removed film of rotary tillage planting(T3), new film mulching planting (T4), and flat planting no mulch(CK). The results showed that the mulching methods could improve yield, commodity potato rate, and WUE. Compared with CK, the yield increased by 14.24%~56.33%, the commodity potato rate increased by 1.21%~22.60%, the WUE increased by 8.28%~55.39%. The yield and dry weight per potato plant in tuber initiation stage were significantly positively correlated(r=0.744), covering planting significantly increased the dry weight per potato plant in tuber initiation stage by 118.0%~720.0% (P<0.05), and the T4 was the best. The effect of mulching treatment on the characteristics of soil temperature and water for potato field was significant (P<0.05). Compared with CK, the cooling effect of T1 and T2 was significantly smaller than that of T3, and there was no significant difference between T3 and T4 in water storage and moisture conservation, but significantly better than T1, T2, and CK.It can be seen that under the experimental condition, the yield of small ridge mulching straw and big ridge removed film of rotary tillage plantingwere better than that of direct seeding with the old film, and slightly lower than that of the new mulching, but the effect on water storage and soil moisture conservation was similar to that of the new film mulching. At thesame time, small ridge mulchingstraw and big ridge removed film of rotary tillage planting had better effect in decreasing temperature and increasing soil moisture than other mulching treatments, which was beneficial to the formation and expansion of potato tuber.
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