| Effects of irrigation limits at bud stage and flowering stage on yield of drip irrigation cotton |
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| DOI：10.7606/j.issn.1000-7601.2019.05.05 |
| Key Words: lower limits of irrigation cotton drip irrigation bud stage flowering and boll stage Logistic models |
| Author Name | Affiliation | | PAN Jun-jie | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | FU Qiu-ping | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | Abudoukayimu·Abulimiti | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Beijing Unism Technologies, Inc., Beijing 10008, China | | Ma Ying-jie | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| To explore the suitable lower limits of drip irrigation, a field experiments including the lower irrigation limits, which were 55% (bud stage only), 65% and 75% of field capacity and the different combination at bud stage and flowering stage was carried. The growth and yield of cotton under different drip irrigation conditions were studied. The results showed that the increase of irrigation water limit obviously promoted effect on plant height and biomass. With the increase in irrigation water limit, the plant height increased 0.18~0.19 cm·d-1 at bud stage and 0.04~0.10 cm·d-1 at flowering and boll stages, the biomass increased 11.58~20.44 g·plant-1 at bud stage and 3.47~4.04 g·plant-1 at flowering and boll stages. When the lower limits of irrigation was at 65% θf at bud stage and 75% θf at flowering and boll stages, the boll weight per plant was 5.58 g and the number of bolls per plant was 7.79, which was obviously higher than others; When the lower limits of irrigation was 75% θf at bud, flowering and boll stages, the water consumption was more than others at 517.05 mm. When the lower limits of irrigation was 55% θfat bud stage and 65% θf at flowering and boll stages, the yield of seed cotton was significantly lower than that of other treatments. There was no significant difference in yield between the treatments, which the lower limits of irrigation was 65% θf at bud stage and 75% θf at flowering and boll stages, and the treatment that the lower limits of irrigation was 75% of field capacity at bud stages and flowering and boll stages. Therefore, the best lower limits of irrigation was 65% θf at bud stage and 75% θf at flowering and boll stages. In regard to the number of days after sowing as independent variable, Logistic model can simulate cotton plant height and biomass very well, and then the water consumption was introduced, a model for predicting cotton biomass change with water consumption and plant height as independent variables was established. This study could provide guidance for the prediction of irrigation water limit and growth status of cotton drip irrigation in similar areas. |
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