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| DOI：10.13522/j.cnki.ggps.2020072 |
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| The Effects of Polyacrylamide Amendment on Ability of Gravelled Soil to Retain Water and Fertilizer and Its Consequence for Yield and Quality of Wine Grape |
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JI Lidong, LI Lei, SI Haili, YANG Yang
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Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
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| Abstract: |
| 【Background】Poor soil structure and leaching of water and fertilizers are two abiotic factors facing construction of sustainable wine grape production in the gravelled soil in regions proximal to the eastern foot of Helan mountain, Ningxia. Amending the soil with conditioner could improve its structure.【Objective】This paper presents the results of an experimental study on efficacy of amending the soil with polyacrylamide (PAM) in improving structure of the gravelled soil and its ability to retain water and nutrients, as well as its consequence for yield and fruit quality of wine grapes.【Method】The experiment was conducted in a field vineyard. Fertilization in the experiment was the same - applying 6 000 kg/hm2 of organic fertilizer. Added to this were different PAM applications ranging from 0 (CK) to 1 200 kg/hm2. In each treatment, we measured the change in water-stable aggregates, soil moisture content, chemical properties of the soil, as well as yield and quality of the wine grape.【Result】Combined application of PAM and organic fertilizer significantly increased the content of water-stable aggregates >2 mm at the expense of water-stable aggregates <0.25 mm, and soil water content in 20~60 cm soil layer. Of all treatments, PAM applied at 1 200 kg/hm2 increased soil water storage most. Applying PAM more than 600 kg/hm2 boosted the growth of grape ears and increased the grape yield by 44.08% compared with the conventional fertilization without adding PAM. Analysis showed that in terms of improving yield, the optimal PAM application was 1 161.23 kg/hm2. Applying 900 kg/hm2 of PAM did not only significantly increase the content of soluble solids and reduce the content of sugar and total phenols in the grapes, it also enhanced soil organic matter and increased the ability of soil to retain nitrogen and potassium nutrients.【Conclusion】When fertilization was 600 kg/hm2 of organic fertilizer, the optimal PAM application for the gravelled soil in the eastern foot of the Helan Mountain was 900 kg/hm2 to improve soil quality and increase grape yield. |
| Key words: wine grape; gravelled soil; polyacrylamide amendment; water-stable aggregates; soil water storage; yield |
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