| Cite this article: | 李文玲,孙西欢,张建华,等.水氮耦合条件下温室番茄水氮生产函数研究[J].灌溉排水学报,0,():-. |
| liwenling,sunxihuan,zhangjianhua,et al.水氮耦合条件下温室番茄水氮生产函数研究[J].灌溉排水学报,0,():-. |
|
| |
|
|
| This article has been：Browse 1507Times Download 0Times |
|
|
|
| DOI： |
|
| Study on Water and Nitrogen Production Function of Greenhouse Tomato in Water and Nitrogen Coupling |
|
liwenling1, sunxihuan1, zhangjianhua2, majuanjuan1, guoxianghong1, leitao1, sunruifeng1, songtao2
|
|
1.College of Water Resources Science and Engineering, Taiyuan University of Technology;2.Shenzhen Institute of Hong Kong Baptist University
|
| Abstract: |
| 【Objective】In order to explore the effect of water-nitrogen coupling under mulch drip irrigation on the yield of greenhouse tomato, and to find the key stage of water demand affecting the yield of tomato, so as to provide theoretical basis for water-saving and efficient production of tomato.【Methods】Four factors and three levels of water nitrogen coupling orthogonal test were set up to study the tomato yield under the coupling of water and nitrogen in greenhouse, Jensen model of tomato water nitrogen production function was established, and its water sensitive index accumulation curve was established, and the water nitrogen coupling yield of Tomato in plastic greenhouse was used to verify the water nitrogen production model.【Results】The trend of tomato yield calculated by the model is consistent with the measured yield. The square sum of model fitting residuals (SSE) is 0.009 6, and the determination coefficient R2 is 0.875. It is verified that the root mean square error, average relative error and average absolute error between the calculated value and the measured value are 2.98 t/hm2, 2.53 % and 2.39 t/hm2, respectively. The water sensitive index of each growth stage is "flowering stage (λ2=0.20)>seedling stage (λ1=0.096)>mature stage (λ3=0.059)". The water sensitive index calculated by the cumulative curve of water sensitive index has a good fitting effect with the water sensitive index of Jensen model. The significant effect of each factor on tomato yield is "irrigation at flowering stage>irrigation at seedling stage>nitrogen application>irrigation at maturity stage", and the effect of irrigation at flowering stage on yield reaches significant level (P<0.05). The yield of T1 treatment was 72.92 t/hm2, which was the highest.【Conclusion】The water and nitrogen production function established in the experiment has high simulation accuracy, and can be used in the yield simulation of greenhouse tomato film drip irrigation and nitrogen coupling. The cumulative curve of water sensitive index is more accurate for the calculation of water sensitive index, which can be used for the prediction of sub sensitive index. The water sensitive index of flowering stage was the highest. The theoretical optimal scheme for high yield of tomato was 0.75I in seedling stage, I in flowering stage, I in mature stage and 350 kg/hm2 in nitrogen application. |
| Key words: Water nitrogen coupling; tomato; yield; water and nitrogen production function |
|
|
|
|
|
|
