doi:

DOI: 10.3724/SP.J.1006.2019.84097

Acta Agronomica Sinica (作物学报) 2019/45:5 PP.714-727

Effects of straw strip mulching on furrows and planting in ridges on water use efficiency and tuber yield in dryland potato


Abstract:
Field experiments were conducted to study the effects of different mulching materials and ridge-furrow widths on potato (Solanum tuberosum L.) growth, tuber yield, soil moisture and water use efficiency in a semiarid rain-fed ecosystem in northwest China in 2016 and 2017. Four treatments were performed:(1) alternating narrow furrows and wide ridges with corn straw strip mulching only on narrow furrows and planting in the wide ridges (RFWN); (2) alternating micro-ridge-furrows with corn straw strip mulching only on furrows and planting in the ridges (RFN); (3) alternating small and large ridges full mulching with black plastic film and planting in the large ridges (RFB), and (4) traditional-flat planting without mulching (CK). Compared with CK, mulching treatments significantly decreased total evapotranspiration by 6.1%-13.2%, increased average soil water content (1.2-1.8 m depth) by 7.6% at tuber initiation stage, and RFB treatment significantly increased soil water content (0-0.2 m) by 30.3% at starch accumulation stage in the dry year of 2016. In the normal precipitation year of 2017, the total evapotranspiration in RFB was 22.2% lower than that in CK, and there was no significant difference in total evapotranspiration observed among the RFWN, RFN and CK treatments. The average soil water content (0-2 m depth) in mulching treatments was 8.7%, 13.0%, and 13.1% higher than that in CK, respectively, at tuber initiation, tuber bulking and starch accumulation stage in 2017. Compared with CK, mulching treatments significantly increased soil water storage (0-2 m), weight of dry matter per plant and final plant height by 5.4%-15.5%, 12.8%-147.4%, and 21.1-39.7 cm, respectively, and thus enhanced tuber yield and water use efficiency by 51.6%-88.2% and 68.2%-111.7% in both years, respectively. The tuber yield, water use efficiency and net income for RFN treatment was the highest increasing on average by 87.8%, 97.5%, and 254.2%, respectively, in both years. In addition, RFN had the advantages of simple operation, the environmentally friendly and the highest input/output ratio compared with the treatment of plastic film mulching. Hence, RFN is the best cultivation model for dryland potato.

Key words:ridges-furrows culture,plastic film mulching,straw strip mulching only on furrows,dryland potato,tuber yield,water use efficiency

ReleaseDate:2019-11-05 15:30:01



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