(3) Proline content Proline (Pro) content in alfalfa leaves showed an increasing trend with the progression of planting years and was significantly influenced by the type of water-retaining agent, the application rate, and their interaction ( p < 0.05, Figure 4 ).
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Effects of Water-Retaining Agent Application on Growth Physiological Characteristics and Yield of Alfalfa (<i>Medicago sativa</i> L.).
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The sentences
The results showed that alfalfa plant height, stem diameter, leaf area, branch number, soluble sugar (SS), soluble protein (SP), and proline (Pro) all exhibited a decreasing trend with increasing cutting times.