| Effects of water and nitrogen coupling on growth, photosynthetic characteristics and nutrient allocation of pepper in solar greenhouse |
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| DOI：10.7606/j.issn.1000-7601.2018.05.20 |
| Key Words: water and nitrogen coupling hot pepper photosynthetic characteristics nutrient distribution solar greenhouse |
| Author Name | Affiliation | | MA Guo-li | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Guo-bin | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | QIANG Hao-ran | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Bai-yang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | JI Lei | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Jing | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SU Jin-chang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | DU Miao-xin | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the effects of different irrigation amount and nitrogen fertilizer application on the growth, photosynthetic treats and nutrient distribution of pepper in protected field, and to provide theoretical basis for proper irrigation and nitrogen application in pepper development. F1, F2, F3 was 150%, 100% and 50% nitrogen fertilizer respectively of the theoretical utilization rate. And no fertilization (F0) was used as CK. W1, W2 and W3 of the three substrates were 80%, 60% and 40% of the maximum water content of the substrate respectively. The results show that: Under the condition of high water and high fertilizer, the maximum value of dry and fresh weight was 1314.02g and 217.89g.The maximum values of stem diameter and plant height were 193.57cm and 19.57mm, which were significantly higher than those of low water and low fertilizer treatments.However, under the condition of low water and low fertilizer, the dry matter accumulation rate of pepper was higher than that of high water and high fertilizer, the effect on pepper’s photosynthetic fluorescence parameters was as follows:In medium and high basal water content level, fertilizer application increased the light utilization efficiency of pepper.the photosynthetic parameters of pepper in high fertilizer treatment increased by more than 15% compared to low fertilizer treatment. The intercellular CO2 concentration (Ci) and the non-photochemical quenching coefficient (NPQ) were decreased, and the photosynthesis and CO2 assimilation rate were increased.At the same time, it reduces the dissipation of light energy in other forms during photosynthesis. Under low water condition, the changes of photosynthetic fluorescence of pepper showed an opposite trend with the increase of the water content of medium and high substrate, with nitrogen application rate increasing. The general trend of nutrient distribution in pepper was: there was no significant difference in the accumulation of N, P and K under different treatments in pepper during the pre-planting period (0~60 d).The accumulation of potassium and phosphorus in all the organs except phosphorus in stem of pepper increased gradually, and reached the maximum at 180~210 d after planting. The nitrogen in all organs and phosphorus of stem increased first and then decreased.The order of accumulation of N, P and K in different organs of pepper was as follows: fruit> stalk> leaf> root; and the content from high to low was: nitrogen> potassium> phosphorus in the whole growth period.Conclusion: High-water medium fertilizers significantly promoted the growth of dry weight, plant height and stem diameter of pepper, which was beneficial to the photosynthesis of pepper leaves and the uptake and accumulation of N, P and K. The effect of low-water high fertilizer treatment on pepper was not significant in the beginning. Significantly, 180 days after colonization, low water and high fertilizer had an antagonistic effect on the growth of pepper. The growth of pepper was the weakest under this treatment, which was disadvantageous to the photosynthates and the accumulation of nutrient. |
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