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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (4): 53-61.DOI: 10.11686/cyxb2021036

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Effect of reducing chemical fertilizer and substitution with microbial fertilizer on the growth of Elymus nutans

Dong-rong HAN(), Tuo YAO(), Hai-yun LI, Min-hao CHEN, Ya-min GAO, Chang-ning LI, Jie BAI, Ming SU   

  1. Pratacultural College,Key Laboratory of Grassland Ecosystem,Ministry of Education,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2021-01-26 Revised:2021-03-31 Online:2022-04-20 Published:2022-01-25
  • Contact: Tuo YAO

Abstract:

This research aimed to identify the ideal ratio of microbial fertilizer (MF) and chemical fertilizer (CF) to promote growth of Elymus nutans. Compared with a typical CF application of 300 kg·ha-1, this study explored fertilizer reductions of 20% or 40% (80%CF and 60%CF, respectively) and substitution with MF at rates of 60, 90, 120, 150 or 180 kg·ha-1. Effects on agronomic characters, the root system and nutritional quality of E. nutans were evaluated. It was found that at the first harvest, 80%CF (240 kg·ha-1) combined with 90 kg·ha-1 MF increased E. nutans plant height, stem thickness and hay yield by 34.86%, 44.83% and 3.08%, respectively compared with CK, while 80%CF combined with 120 kg·ha-1 MF increased the crude fat content of plants by 22.97% compared with CK and decreased acid detergent fiber content by 6.59%. 80%CF combined with 150 kg·ha-1 MF increased plant crude protein content by 36.09% and 80%CF (240 kg·ha-1) combined with 90 kg·ha-1 MF decreased neutral detergent fiber content by 15.64%. At the second harvest, 80%CF combined with 60 kg·ha-1 MF increased total plant root length by 34.77% compared with CK; 80%CF combined with 90 kg·ha-1 MF increased plant height, stem thickness, hay yield and the total root surface area by 80.43%, 66.34%, 13.08% and 8.66%, respectively; 80%CF combined with 120 kg·ha-1 MF increased plant crude protein and crude fat content, total root volume, underground fresh weight and underground dry weight by 25.30%, 14.61%, 45.54%, 19.39% and 51.04%, respectively; 80%CF combined with 180 kg·ha-1MF reduced acid detergent fiber and neutral detergent fiber content of plants by 8.13% and 8.88%, respectively, compared with CK. Through principal component analysis, the combined application of 20% fertilizer reduction (240 kg CF·ha-1) and 90 kg·ha-1 microbial fertilizer gave the best growth promotion effect on E. nutans.

Key words: Elymus nutans, microbial fertilizer, agronomic traits, root system, nutritional quality