Influence of applying improvers on growth of perennial ryegrass in rocky desertification land

In order to explore the influence of soil improvers on the growth, turning green and yield of perennial ryegrass in rocky desertification land, the pot experiment was conducted with exogenous cattle manure carbon, wormcast, water retaining agent, longterm organic compound fertilizer, straw powder， and so on. With application of wormcast, seedling emergence time reduced by 50.00%, seedling emergence rate and tiller number(60 d) increased by 46.24% and 46.34%, respectively, compared with the treatments without using soil improvers. This treatment was better than the treatments with other soil improvers applications. The increase of plant height and fresh weight of perennial ryegrass were the highest with the application of compound fertilizer. The turning green recovery time, plant height, fresh weight and tiller number of the treatment with straw power were the best during the turning green recovery period. In conclusion, the improving effects of different improvers on ryegrass growth decreased in the following order: wormcast>compound fertilizer, cow dung carbon, water retaining agent>CK>straw power. The improving effects of different improvers on turning green recovery decreased in the following order: straw powder>compound fertilizer, wormcast, waterretaining agent>CK>cow dung carbon. These results suggested that the optimum soil improvers can promote the growth of perennial ryegrass.