| The effect of water\|potassium integration in drip irrigation on the photosynthetic characteristics of kiwifruit |
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| DOI：10.7606/j.issn.1000-7601.2020.04.02 |
| Key Words: kiwifruit diurnal variation of photosynthesis integration of water and potassium drip irrigation K fertilizer application |
| Author Name | Affiliation | | TANG Fan | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065,China | | CUI Ningbo | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065,China； Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHAO Lu | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065,China | | ZHENG Shunsheng | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065,China | | GONG Daozhi | State Engineering Laboratory for Efficient Water Use and Disaster Loss Reduction of Crops, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Science, Beijing 100081, China | | HU Xiaotao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China | | FENG Yu | State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065,China |
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| Abstract: |
| In order to find out the effect of different water\|potassium (K) integrated management on kiwifruit photosynthesis, the Jinyan kiwifruit for 8 years was selected as the test material. There was a control treatment with irrigation amount of 31.2 m3·667m-2 and 26.4 m3·667m-2 and K application of 6.0 kg·667m-2 and 7.8 kg·667m-2 (CK) at fruit expansion stage (III) and fruit maturity stage (IV), and 3 irrigation deficit levels including sever water deficit(SD), medium water deficit (MD), and light water deficit (LD) with irrigation amount was 40%, 60%, and 80% of CK, respectively, and 2 K fertilizer application levels (low K and high K of 60% and 80% of CK, respectively) were set at III and IV stages.The results showed that the diurnal variation trends of photosynthetic index were similar in the two growth stages under different water and K integrated drip irrigation treatments. Under the LD treatment, the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), instantaneous water use efficiency (WUEi) and carboxylation rate (CE) of leaves increased with increasing the application amount of K. Pn and CE of III-LDHK are 15.71% and 16.80% higher than that of III-LDLK, Pn and Gs of IV-LDHK were 6.07% and 12.76% higher than that of IV-LDLK, and the difference was significant (P<0.05). Under the SD treatment, except intercellular CO2 concentration (Ci), all photosynthetic indexes decreased significantly compared with CK (P<0.05). Under the MD treatment, except Ci and WUEi, all photosynthetic indexes decreased significantly compared with CK (P<0.05). Under the same K application rate, except Ci and WUEi, the photosynthetic indexes increased significantly with increasing water irrigation (P<0.05), and the increase rate was 11.42%~64.40%. Compared with CK and Pn of III-LDHK treatment increased by 11.38% (P<0.05), WUEi increased by 3.06%; Pn of IV-LDHK increased by 0.96%, WUEi increased by 2.00%. In summary, under III-LDHK and IV-LDHK treatmetns, the photosynthetic capacity of kiwifruit was stronger, and saved the water irrigation and K fertilizer application by 20% at the corresponding growth stage, which was a more suitable integrated management mode of water and K for drip irrigation. |
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