Effects of Different Field Water Capacity on Root System Characteristics and Yield of Potato under Drip Irrigation with Plastic Mulch
Zhitao LI, Wenjing MA, Jinyong ZHU, Tianbin SHI, Hongyang LI, Limin CHEN, Junlian ZHANG, Yuhui LIU, Zhen LIU
Effects of Different Field Water Capacity on Root System Characteristics and Yield of Potato under Drip Irrigation with Plastic Mulch
To investigate the effect of different field water capacity on potato root growth and improve potato yield in the Northwest. The potato variety Hermes was grown in the field under a rain shelter and film mulching with drip irrigation under six field water capacity gradient treatments(85%-95%,75%-85%,65%-75%,55%-65%,45%-55% and non-irrigation)in 2018 to investigate the effects of different field water capacity on root system characteristics,tuber yield and relevance. The results showed that the root distribution gradually deepened as the field water holding capacity decreased,and when the field water holding capacity was greater than 45%,the roots were mainly distributed at 0-10 cm of the monopoly surface;when the field water holding capacity was less than 45%,the roots were mainly distributed at 20-40 cm of the monopoly side. Tuber yield and large potato rate were higher under the field water capacity of 65%-95% than that under other treatment,and the compensation effect was significant(P<0.05). Among them,the field water capacity of 75%-85% treatment had the highest yield,with an average yield of 884.06 g/plant,which was 257.61% higher than the T6 treatment. Correlation analysis revealed that field water capacity was significantly(P<0.05)positively correlated with top root length,root surface area,large potato rate and tuber yield,and top root length and surface area were significantly(P<0.05)positively correlated with potato tuber yield. In summary,field water capacity greater than 65% significantly increased root length,root surface area and yield on the monopoly surface,with the highest yields achieved under the 75%-85% water capacity treatment.
Potato / Drip irrigation with plastic mulch / Root system characteristics / Yield {{custom_keyword}} /
Tab.1 Times and amounts of drip irrigation during potato growth period under different water treatments表1 不同年份马铃薯生育期内不同水分处理的滴灌次数和滴灌量 |
处理 Treatment | 滴灌次数 Times of drip irrigation | 总滴灌量/mm Total amounts of drip irrigation |
---|---|---|
T1 | 17 | 553.20 |
T2 | 17 | 413.46 |
T3 | 16 | 249.75 |
T4 | 11 | 109.35 |
T5 | 10 | 73.95 |
T6 | 2 | 30.24 |
Tab.2 Effect of different water treatments on yield and its components of potato表2 不同水分处理对马铃薯单株产量及其构成因素的影响 |
处理 Treatment | 单株产量/g Yield of per plant | 大薯率/% Large tuber rate | 中薯率/% Medium tuber rate | 小薯率/% Small tuber rate |
---|---|---|---|---|
T1 | 821.70±68.17a | 50.91±1.33a | 42.47±1.63b | 6.62±0.71a |
T2 | 884.06±47.61a | 48.46±4.62a | 42.34±3.45b | 9.20±1.29a |
T3 | 654.34±30.62b | 51.67±4.44a | 38.10±3.86b | 10.23±0.62a |
T4 | 370.32±13.12c | 16.14±2.98b | 68.67±2.82a | 15.20±5.48a |
T5 | 326.00±31.12c | 21.95±2.50b | 62.27±2.43a | 15.78±2.25a |
T6 | 247.22±32.71c | 15.19±7.91b | 69.32±5.77a | 15.49±2.79a |
注:不同小写字母表示各处理间差异显著(P<0.05)。 | |
Note:Different lowercase letters indicate significant differences between treatments(P<0.05). |
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