Meta-analysis of effects of regulated deficit irrigation on yield and quality of alfalfa

doi:10.3969/j.issn.1004-1524.20230072

Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (6): 1256-1269.DOI: 10.3969/j.issn.1004-1524.20230072

• Crop Science • Previous Articles Next Articles

Meta-analysis of effects of regulated deficit irrigation on yield and quality of alfalfa

XU Liting(), QI Guangping^*(), KANG Yanxia, YIN Minhua, MA Yanlin, JIA Qiong, WANG Jinghai, JIANG Yuanbo

College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, China

Received:2023-01-16 Online:2024-06-25 Published:2024-07-02

Abstract

Abstract:

To explore the response of alfalfa yield and quality to regulated deficit irrigation under different influencing factors and provide theoretical basis for alfalfa planting, the comprehensive effect was quantitatively studied in the present study, as well as the main influencing factors under regulated deficit irrigation with full irrigation as the control by integrating published relevant field test data and using meta-analysis method. The results showed that, compared with the full irrigation, the yield of alfalfa under regulated deficit irrigation decreased by 19.3% (95% confidence interval:-22.5%-16.0%), but the quality was significantly (P<0.01) improved. The crude protein content was increased by 14.5% (95% confidence interval: 12.4%-16.6%), while the acid detergent fiber content and neutral detergent fiber content were decreased by 10.8% (95% confidence interval:-12.3%--9.2%) and 13.2% (95% confidence interval:-14.4%--11.9%), respectively. Given the yield and quality effects, annual average temperature of 0-5 ℃ and>10-15 ℃, annual precipitation of <200 mm and >400-800 mm, the regulated deficit irrigation would be conducive for the alfalfa yield and quality with planting density of >20-25 kg·hm^-2. In different agricultural production areas, the regulated deficit irrigation with drip irrigation, regulated deficit at different growth period, and a regulated deficit degree of 75%-85% (based on the field capacity) would maintain sound production effect of alfalfa.

Key words: alfalfa, deficit irrigation, yield, quality, meta-analysis

CLC Number:

S275.9

XU Liting, QI Guangping, KANG Yanxia, YIN Minhua, MA Yanlin, JIA Qiong, WANG Jinghai, JIANG Yuanbo. Meta-analysis of effects of regulated deficit irrigation on yield and quality of alfalfa[J]. Acta Agriculturae Zhejiangensis, 2024, 36(6): 1256-1269.

Figures/Tables 8

Fig.1 Frequency distribution histogram and Gaussian distribution curve of regulated deficit irrigation on alfalfa yield and quality n, Sample size; AVE, Average. The same as below.

Fig.2 Sensitivity analysis of regulated deficit irrigation on alfalfa yield (a), crude protein content (b), acid detergent fiber content (c) and neutral detergent fiber content (d)

Table 1 Comprehensive effects of regulated deficit irrigation on yield and quality of alfalfa

指标 Index	变化率 Change rate/%	95%置信区间 95% confidence interval/%		效应量检验结果 Effect test result		异质性检验结果 Heterogeneity test result		样本量 Sample size
指标 Index	变化率 Change rate/%	下限 Lower limit	上限 Upper limit	Z	P	Q	P	样本量 Sample size
产量Yield	-19.3	-22.5	16.0	-11.7	<0.000 1	243 615.5	<0.000 1	280
粗蛋白含量	14.5	12.4	16.6	13.6	<0.000 1	9 470.9	<0.000 1	109
Crude protein content
酸性洗涤纤维含量	-10.8	-12.3	-9.2	-13.3	<0.000 1	4 866.7	<0.000 1	83
Acid detergent fiber content
中性洗涤纤维含量	-13.2	-14.4	-11.9	-20.7	<0.000 1	3 530.8	<0.000 1	78
Neutral detergent fiber content

Fig.3 Cumulative meta-analysis of regulated deficit irrigation on alfalfa yield (a), crude protein content (b), acid detergent fiber content (c) and neutral detergent fiber content (d)

Fig.4 Analysis on influencing factors of regulated deficit irrigation on alfalfa yield The deficient degree is measured based on the field capacity.The same as below.

Fig.5 Analysis on influencing factors of regulated deficit irrigation on crude protein content of alfalfa

Fig.6 Analysis on influencing factors of regulated deficit irrigation on acid detergent fiber content of alfalfa

Fig.7 Analysis on influencing factors of regulated deficit irrigation on neutral detergent fiber content of alfalfa

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Meta-analysis of effects of regulated deficit irrigation on yield and quality of alfalfa

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