| Effects of drip irrigation and fertilization cycle and capillary layout on spatio\|temporal distribution of fine root diameters in apple trees |
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| DOI：10.7606/j.issn.1000-7601.2023.01.13 |
| Key Words: apple trees fine root diameter drip irrigation fertilization cycle capillary layout |
| Author Name | Affiliation | | CHEN Jinghang | Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | YE Ruirui | Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | SUN Jianxi | Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | LUO Lihua | Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Can | Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | Wu Yong | National Agricultural Technology Push Light Service Center Water\|Saving Agriculture Division,Beijing 100125, China | | HU Tiantian | Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To explore the regulatory effect of different drip irrigation and fertilization strategies on the fine root diameter of apple trees, a field experiment was conducted during 2019-2021 for a two\|factor two\|level complete combination design.The capillary laying method was set up with one row and one tube and one row and two tubes.The fertilization cycle was set for 15 days and 30 days.The micro root tube in situ monitoring technology was used, which was divided into three directions of the apple tree due south, west and northeast and 0~19 cm, 19~38 cm, 38~57 cm, 57~76 cm soil layers at different depths.The dynamic change of fine root diameter during the active growth period of apple trees was continuously observed, and the response of fine root diameter to capillary arrangement and fertilization cycle of apple trees was analyzed.The results showed that the diameter of fine roots was mainly concentrated in the range of 0.5~1.5 mm, accounting for about 90%, and the diameter of fine roots of 0~0.5 mm and 1.5~2.0 mm was very small.Before July 2020 and June 2021, there was an increase in the number of fine roots with a diameter of ≤1.0 mm. After July and June, the diameter of the fine roots was thickened, and the number of fine roots with a diameter of > 1.0 mm increased rapidly.Compared with the fertilization cycle of 15 days, the fertilization cycle of 30 days increased the fine root diameter in June\|November 2020 and April\|July 2021. In most soil layers, the fertilization cycle of 30 days increased the fine root diameter, and the fertilization cycle of 15 days reduced the fine root diameter.In the south and northeast directions of 2020, the fertilization cycle of 15 days reduced the fine root diameter, and the fertilization cycle increased the fine root diameter for 30 days.One row and one tube increased the fine root diameter in 2020 and August 2021 compared with one row and two tubes.In shallow middle soils (0~38 cm soil layer), one row and two tubes tended to increase the diameter of fine roots.In medium and deep soils (38~76 cm soil layer), one row and one tube tended to increase the diameter of fine roots.In the south and northeast directions of 2021, one row and one tube increased the diameter of fine roots, and one row and two tubes reduced the diameter of fine roots. |
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