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| DOI：10.13522/j.cnki.ggps.2022595 |
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| Impact of Planting Spacing and Soil Amendment with Water Absorbent on Root and Leave Senescence Traits of Drip Irrigated Oat |
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TIAN Lu, LIU Jinghui, MI Junzhen, ZHAO Baoping, LI Yinghao, ZHANG Sheng,
WANG Fengwu, JIAO Weihong, XU Zhenpeng, ZHENG Chengzhong
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1. Agronomy College, Inner Mongolia Agriculture University, Hohhot 010019, China; 2. Inner Mongolia Academy of Agricultural &
Animal Husbandry Science, Hohhot 010031, China; 3. Agriculture and Forestry Sciences of Ulanqab, Jining 012000, China;
4. Agricultural and Animal Husbandry Ecological Resources Protection Center of Ulanqab, Jining 012000, China
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| Abstract: |
| 【Objective】 Roots and leaves are highly influenced by a multitude of biotic and abiotic factors. Taking oat under drip irrigation as an example, this study delves into the response of its root and leave traits to planting density and soil amendment with water absorbent polymer.【Method】The field experiment was conducted in 2019—2020 with intra-row planting spacing being 20 cm, and the inter-row planting spacing being 20 cm (A), 15 cm (B) and 10 cm (C), respectively. In each treatment there were two soil amendments by applying 0 and 22.5 kg/hm2 of a water absorbent polymer. Senescence traits of the roots and flag leaves in each treatment were measured.【Result】①Both row spacing and soil amendment affected root activity, SOD and MDA content, and soluble protein content in the roots and leaves significantly with P<0.01 or P<0.05. The combined effect of row spacing and soil amendments on root and leaf traits varied with growth stage. In the flowering and filling stages, the combined effect of planting spacing and soil amendment was significant with P<0.01 or P<0.05 on SOD content in roots and leaves, MDA content in root and soluble protein in the roots the leaves, but insignificant on MDA content in the roots. ②Regardless of soil amendment, the impact of row spacing on root activity, SOD activity in the roots and leaves and soluble protein in the roots and leaves was ranked in the order of B>A>C, while the impact on MDA content in the roots and leaves was in the order of C>A>B. Combined with soil amendment, reducing row spacing from 20 cm to 15 cm increased root activity, SOD activity in the roots and leaves, soluble protein content in the roots and leaves by 5.56%~15.27%, 4.78%~5.89%, 3.98%~10.62%, 5.20%~23.74% and 5.89%~15.04% respectively, while reducing MDA content in the roots and leaves by 11.79%~13.86% and 6.01%~14.08%, respectively. Reducing the row spacing further to 10 cm significantly reduced the above traits, except the soluble protein content, which did not show significant changes, and MDA content in the roots and leaves, which showed a significant increase. Without soil amendment, the impact of row spacing on root and leaf traits varied with growth stage and year. ③When row spacing was 20 cm, compared with no amendment, amending the soil increased SOD activity and soluble protein content in the roots and leaves by 7.52%~15.75%, 3.21%~6.47%, 7.25%~10.47%, 18.01%~22.47% and 4.87%~9.10%, respectively, while reducing MDA content in the roots and leaves by 8.79%~13.96% and 7.35%~11.67%, respectively. In contrast, the effect of soil amendment on the above traits varied when the row spacing was 10 cm. ④The senescence traits of roots and leaves were correlated with biomass and grain yield of the oat, both at significant levels.【Conclusion】Reducing the row spacing from 20 cm to 15 cm, combined with soil amendment by applying 22.5 kg/hm2 of the water-absorbent polymer, is effective in reducing senescence of roots and leaves of the drip-irrigated oat and consequently promoting its biological yield and grain yield. |
| Key words: oat; drip irrigation; row spacing; super absorbent polymer; senescence characteristic |
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