Synergistic Regulatory Effects of Water-Nitrogen Coupling on Osmotic Regulation, Yield, and Forage Quality of Alfalfa
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View abstract on PubMed
Summary
This summary is machine-generated.Optimizing water and nitrogen levels in alfalfa (Medicago sativa L.) production significantly boosts yield and forage quality. Full irrigation (W4) and medium nitrogen (N2) application enhance crop productivity and nutritional value in arid regions.
Area Of Science
- Agricultural Science
- Agronomy
- Plant Physiology
Background
- Water scarcity and poor soil fertility limit agricultural production in arid and semi-arid Northwest China.
- Synergistic water-nitrogen management is crucial for enhancing crop growth and agricultural productivity in these regions.
Purpose Of The Study
- To systematically analyze the effects of varying water and nitrogen levels on alfalfa (Medicago sativa L.) osmotic adjustment substances, yield, and forage quality.
- To determine the optimal water-nitrogen coupling strategy for maximizing alfalfa yield and forage quality in arid environments.
Main Methods
- Four irrigation levels (W1-W4) and four nitrogen application rates (N0-N3) were applied to alfalfa.
- Measurements included osmotic adjustment substances (proline, soluble protein, soluble sugar), yield, and forage quality parameters (CP, RFV, ADF, NDF).
- Statistical analyses, including correlation and principal component analysis, were employed to evaluate treatment effects.
Main Results
- Water deficit increased proline content but decreased soluble protein and sugar. Nitrogen application improved osmotic adjustment substances, with optimal levels at N2 for proline and soluble protein, and N3 for soluble sugar.
- Alfalfa yield significantly increased with irrigation levels (W4 > W1) and showed an optimal response to medium nitrogen (N2).
- The full irrigation and medium nitrogen (W4N2) treatment maximized crude protein (CP) and relative feed value (RFV), while reducing fiber content (ADF, NDF), significantly outperforming the W1N0 treatment.
Conclusions
- Alfalfa's physiological responses, yield, and forage quality are significantly influenced by the interaction of water and nitrogen.
- Full irrigation (W4) combined with medium nitrogen application (N2) represents an optimal strategy for enhancing alfalfa yield and forage quality in arid regions.
- Balancing osmotic adjustment substances through strategic water-nitrogen management is key to improving crop performance and forage value.
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