Effects of fertilization gradient on the production performance and nutritional quality of cultivated grasslands in karst areas.

glomerata , dry matter yield, plant height, and coverage had highly significant positive correlations with each other, and highly significant negative correlations with dry/fresh ratio.

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glomerata showed a trend of gradual increase with increasing fertilization gradient, except in 2019 and 2020; and peaked under the fertilization gradient of 40 t/hm 2 ( Figure 1 ).

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sativa first presented an increasing trend, then decreased with increasing fertilization gradient, with a peak at 20–30 t/hm 2 fertilization gradient.

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