保水剂用量对贵州旱作覆膜马铃薯生长 及土壤肥力的影响.

[Objectives]The purpose of this paper is to explore the effect of water retention agent (SAP) on potato growth in high altitude area of Guizhou, and to provide references for high-yielding cultivation of potatoes and efficient application of water and fertilizer in Guizhou. [ Methods] A field experiment including water retention agent dosage is done. This research takes the ‘ Taro 5 ’ as the experimental material, five water retention agent dosages(0, 37.5, 52.5, 67.5, and 82.5 kg/hm2 ) is arranged to study the effect of SPA on the yield, potato character, nutrient quality and soil fertility of potato, to determine the appropriate amount of water retention agent in this area. [ Results] The results showed that the potato seedling rate after applying the water retention agent was up to 93. 37 % , the yield increased by 7.96 % - 13. 37 % compared with T1 treatment, and the yield of single plant was 6.81 % -45.45 % , and the yield of single plant increased by 34. 92 % -83.31 %. Application of super absorbent polymers could significantly improve the potato starch content by 2.49 -5.35 percentage compared with T1 treatment, but the nitrogen, phosphorus, potassium, moisture content and reducing sugar content had no obvious effect. In terms of soil nutrient changes, the contents of soil organic matter, total nitrogen, total phosphorus, available phosphorus and available potassium were increased by 4. 61 % -27.01 % , 0 -19.01 % , 7.83 % - 15. 65 % , 5. 73 % -22.49 % and 5.08 % -25.42 % respectively compared with T1 treatment. [ Conclusions] The recommended application of water-retaining agent 52.5 -82.5 kg/hm2 was beneficial to high yield and soil fertility of potato in the high altitude area of Guizhou. [ABSTRACT FROM AUTHOR]