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| DOI：10.13522/j.cnki.ggps.2020198 |
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| Water Consumption of Banana Seedling and Suitable Water-saving Irrigation Scheme for It |
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ZHOU Chenping, YAO Jiaojiao, YANG Hu, KUANG Ruibin, YANG Min, LUO Xiaoyan, HUANG Bingxiong, WEI Yuerong
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Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences;Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization (MOA); Guangdong Province Key Laboratory of Tropical and Subtropical Fruit Tree Research, Guangzhou 510640, China
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| Abstract: |
| 【Background】Excessive irrigation and fertilization during seedling stage of banana are common in China, which is not only a waste of resources and increases costs, but also compromises plant quality and undermines healthy and sustainable banana production. 【Objective】The purpose of this paper is to investigate water consumption of banana seedlings under different soil water contents, as well as its consequence for morphological and physiological traits in attempts to propose an improved water-saving irrigation scheme for banana production in China.【Method】We used the best tissue seedlings of the cultivar Mimosa nana Lour. as the model plant, and conducted the experiment in pots by controlling water content in them in the range from 20% to 90% of the field capacity, with keeping water content at the field capacity as the control (CK). During the experiment, we measured morphological and physiological traits of the plant for each treatment.【Result】Regardless of soil water contents, daily water consumption per plant increased first before plateauing as the plants grew. Increasing soil water content increased daily water consumption per plant, and the difference in water consumption between treatments was significant (P<0.05). Keeping soil water at 70% of the field capacity in the early stage was most effective in improving above-ground morphological and physiological traits, with the leaf numbers and fresh biomass weight increased by 16.67% and 4.95%, respectively, compared to CK. Keeping soil moisture at 80% of the field capacity increased stem diameter and fresh biomass weight at the middle and late stage by 15.64% and 14.27%, and 34.62% and 32.16%, respectively compared to CK; it also enhanced plant height at the late stage by 22.64%. The root traits depended on soil water content and the optimal soil moisture was 80%~90% of the field capacity. In early growth stage, keeping soil moisture at 80% of the field capacity boosted total root length and root surface areas by 19.98% and 19.79% respectively, while in the middle growth stage, it increased root surface area, average root diameter and volume by 12.38%, 20.90%, and 32.06%, respectively, compared to CK. In late growth stage, keeping soil moisture at 90% of the field capacity increased root total length, root surface area and volume by 43.69%, 42.78%, 39.10% and 71.76%, respectively, compared to CK. The allometric model for above- and below-ground biomasses was Y=0.138 6·(x/r)0.7, with R2=0.807 6 and F>F0.01, P<0.01.【Conclusion】The optimal irrigation scheme for banana seedling was: keeping soil moisture at 70% of the field capacity during its early growth stage, and 80% of the field capacity at middle and late growth stage. The allometric model for above- and below-ground biomass can be used to predict change in root biomass based on the above-ground biomass. |
| Key words: banana; seedling; water-saving irrigation; daily water consumption; water consumption |
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