| Study on the effect and its mechanism of continuous cropping on potato growth and soil health |
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| DOI：10.7606/j.issn.1000-7601.2018.04.14 |
| Key Words: continuous cropping potato growth soil health |
| Author Name | Affiliation | | JIAO Run-an | College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China | | XU Xue-feng | College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China | | YANG Hong-wei | College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China | | FENG Huan-qin | College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China | | ZHANG Shu-han | College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China | | ZHANG Jun-lian | Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China
College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Chao-zhou | College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Genetics and Germplasm Enhancement,Lanzhou,Gansu 730070,China | | LI Jian | Gansu AgriculturalＲeclamationTiaoshan Farm,Baiyin,Gansu 730400,China |
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| Abstract: |
| The soil and potatoes of different years from continuous cropping were usedto analyzethe growth changes of patato and factorvariation of soil health from different years (0, 3, 6 years) of continuous cropping. The effect and its mechanism of continuous cropping on potato growth and soil health was reported in this paper. The results showed that aspotato continuous cropping continued, soil organic matter content, available phosphorus content and pH value declined, with 50.72%, 34.10% and 8.68%’s decrease, respectively, compared with CK after 6 years’ continuous cropping. Available nitrogen content rised, with 84.62% and 169.23%’s increase, respectively, compared with CK after 3 and 6 years’ continuous cropping. Soil fertility-related enzyme activity declined gradually, with the decreaseof alkaline phosphatase by 36.34%, urease by 35.72%, sucrase by 29.83% and catalase by 74.16%, compared with CK after 6 years’ continuous cropping. Soil phenolic acids content (except P-hydroxybenzoic acid content) rised, with the increase of hydroxybenzoic acidby 33.61%, vanillic acid by 31.30%, ferulic acid by 51.64%, total phenolic acid by 40.57%, compared with CK after 6 years’ continuous cropping. The number of soil bacteria and actinomycete declined while the number of fungi rised as continuous cropping continued, with the decrease of soil bacteria by 88.59%, actinomyceteby 84.21%, and the increase offungi by 253.85% compared with CK after 6 years’ continuous cropping,which indicated the decline in soil health. MDA content of potato leafrised, with 142.47%’s increase compared with CK after 6 years’ continuous cropping, which indicated lipid peroxidation of potato leaves. Relative chlorophyll content, stomata conductance and net photosynthetic rateof potato leaf declined, with 13.30%, 13.98% and 50.00%’s decrease, respectively, compared with CK after 6 years’ continuous cropping. Potato plant height, stem diameter, aboveground biomass and plant tuber yield declined, with 42.49%, 54.40%, 58.35% and 61.79%’s decrease, respectively, compared with CK after 6 years’ continuous cropping, which indicated the photosynthetic capacity and growth of the potato seedlings were affected by continuous cropping. So it could be concluded that continuous cropping deteriorated the physical and chemical properties of the soil, reduced the fertility-related enzyme activity, maintained the nutrient imbalance and increased the content of phenolic acids, and finally changed the microbial composition of the soil. In a word,continuous cropping deteriorated the soils health as a whole, thusaffected potato growth and development severely. |
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