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| Influences of soil hydrothermal effect on dryland potato growth and yield under various ridge and furrow mulch conditions |
| CHEN Chao, LI Rong, LI Fen, YANG Wenwei, HOU Xianqing |
| School of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China |
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Abstract A little rainfall and low ambient temperature are not conducive to the emergence of potato, but also the high temperature stress restricts the potato tuber formation in the middle and late stages of potato growth in the southern mountainous area of Ningxia, in consequence, they lead to a reduction in potato yield. In view of these problems, a field experiment was conducted in 2016 to study effects of ridge and furrow mulch patterns on soil temperature, moisture, potato growth and yield. The experimental cases include plastic mulch(DM), corn stalk(JG), biodegradable film(SM), hemp fiber mulch(MM), liquid mulch(YM), furrow without mulch(BM), and traditional tillage(CK)(as a control). The results showed that the treatments DM, SM, MM and YM exhibited a warming effect on the soil in the tillage layer, but JG and BM produced a cooling effect. The warming and cooling effects in DM and JG are the strongest, respectively. The treatments YM and DJ had a better water retention effect in the early stage of potato growth, the corresponding soil moistures were significantly improved by 13.3% and 27.0%, respectively, compared with CK. The treatments JG and DM had a better pre-servation effect in the middle and late growth stages, improved by 22.4% and 13.2%, respectively, against CK. JG treatment can promote the potato growth substantially, and its effect on the yield increasement is the most significant. DM treatment is the second better with 47.8% and 44.8% yield increasements against CK. The other treatments are not statistical significance against CK. It is evident that that the implementation of ridge plastic mulch and stalk mulch can regulate the soil hydrothermal environment, promote the growth of potato, and increase the potato yield in the southern mountainous area of Ningxia.
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Received: 04 March 2019
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