Effects of Different Irrigation Quotas on Growth and Yield of Purple Leaf Lettuce in Erhai Lake Basin

doi:10.11924/j.issn.1000-6850.casb2026-0223

Abstract

Abstract:

The study aims to investigate the effects of gradient irrigation quotas on the growth and yield of purple leaf lettuce under plastic mulching and ridge planting in the Erhai Lake Basin, and to provide a theoretical basis for improving water use efficiency. During the critical growth period of purple leaf lettuce, precise water and fertilizer regulation was conducted using an integrated intelligent irrigation system. Irrigation quota was set as the core experimental factor. Local conventional furrow irrigation was used as the control group (CK), and 4 drip irrigation treatments with gradient irrigation quotas were designed: W1 (T), W2 (0.8 T), W3 (0.6 T), and W4 (0.4 T). The results showed that the irrigation quota had a significant effect on the root length and plant height of purple lettuce (P<0.05). Plants under the W2 treatment exhibited relatively coordinated overall growth. The maximum yield of purple-leaf lettuce was obtained under the W2 treatment, at 0.466 t/hm², an increase of 21.62% compared to CK, followed by W1 treatment, at 0.455 t/hm². From the perspective of water use efficiency, W2 treatment and W1 treatment were the preferred options, and W4 treatment was not suitable for the growth of purple leaf lettuce. In conclusion, taking into account the growth status, yield, and water consumption of purple leaf lettuce, the W2 treatment (base-to-cover ratio 3:7, irrigation quota of 0.8 T) is recommended as the optimal irrigation regime for purple leaf lettuce production in the Erhai Lake Basin.

Key words: irrigation quota, purple leaf lettuce, growth status, yield, Erhai Lake Basin

CLC Number:

S636.2

LI Ruijie, LIANG Wei, CHEN Lihong, WANG Shufang, SONG Mingdi. Effects of Different Irrigation Quotas on Growth and Yield of Purple Leaf Lettuce in Erhai Lake Basin[J]. Chinese Agricultural Science Bulletin, 2026, 42(18): 55-61.

Figures/Tables 8

References 26

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生育期	γ土壤容重/(g/cm³)	计划湿润层深度z/mm	ρ湿润比	θ_田持	灌水上限	灌水下限	灌水定额/mm
苗期	1.05	50	0.75	0.32	1	0.70	3.78
莲座期	1.05	100	0.75	0.32	1	0.70	7.56
块茎形成期	1.05	150	0.75	0.32	1	0.70	11.34
成熟期	1.05	200	0.75	0.32	1	0.70	15.12

生育期	γ土壤容重/(g/cm³)	计划湿润层深度z/mm	ρ湿润比	θ_田持	灌水上限	灌水下限	灌水定额/mm
苗期	1.05	50	0.75	0.32	1	0.70	3.78
莲座期	1.05	100	0.75	0.32	1	0.70	7.56
块茎形成期	1.05	150	0.75	0.32	1	0.70	11.34
成熟期	1.05	200	0.75	0.32	1	0.70	15.12

生育时期	苗期	莲座期	旺长期	成熟期
起止日期	10.23—11.15	11.16—12.06	12.07—12.27	12.28—02.10
时间/d	23	20	21	43

生育时期	苗期	莲座期	旺长期	成熟期
起止日期	10.23—11.15	11.16—12.06	12.07—12.27	12.28—02.10
时间/d	23	20	21	43

生育期	N	P	K
苗期	117.6	44.1	161.7
莲座期	237.6	89.1	326.7
块茎形成期	470.4	176.4	646.8
成熟期	352.8	132.3	485.1
合计	1178.4	441.9	1620.3