| Effects of nitrogen rates on dry matter accumulation and distribution of potato plants under film mulching in dry land |
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| DOI：10.7606/j.issn.1000-7601.2016.04.27 |
| Key Words: nitrogen level potato film mulching in dry land dry matter accumulation and distribution source-sink relationship |
| Author Name | Affiliation | | HE Wan-chun | College of Resources and Environmental Sciences/Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China | | HE Chang-fu | College of Resources and Environmental Sciences/Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China | | QIU Hui-zhen | College of Resources and Environmental Sciences/Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China | | ZHANG Wen-ming | College of Resources and Environmental Sciences/Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China | | WANG Ya-fei | College of Resources and Environmental Sciences/Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China | | ZHANG Chun-hong | College of Resources and Environmental Sciences/Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China | | WANG Di | Gansu Key Laboratory of Crop Genetic and Germplasm Enhancement, Lanzhou 730070, China
College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China |
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| Abstract: |
| Field experiment was carried out to evaluate the effect of nitrogen rates on growing stages and dry matter (DM) accumulation of potato cv Longshu No.3 under film mulching in dry land. Six nitrogen rates, 0 (CK or T1), 50 (T2), 100 (T3), 150 (T4), 200 (T5) and 250 (T6) kg·hm-2 were used, and field plots were arranged in a randomized complete block design with four replications. The results showed that the application of nitrogen had significantly positive effect on the duration of growing stages of potato. Nitrogen applications obviously increased the duration of fast accumulation period (Δt) for the whole plant and tubers, being 2～14 days and 2～10 days, respectively. Dynamics of dry matter accumulation in the whole plant and tuber both showed the “S” curve. The dry matter distribution of maturity potato responded differently to nitrogen. With the increase of nitrogen rates, dry matter distribution ratio obviously increased in both stem and leaf, while those of tuber increased first then decreased, exhibiting a single peak curve. Compared with T1, T2 treatment increased the tuber yield by 17.86%, while those of T3, T4, T5 and T6 treatments were decreased by 6.88%, 21.06%, 27.05% and 38.63%, respectively. The depressing effect of N on potato yield may be partly due to the disturbance in sink-source relationship of potato plants, and it is suggested that 50 kg·hm-2 N be the economic rate of N fertilizer in this area. |
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