|
|
|
| Analysis on Fertilization Status and Potential of Fertilizer Reduction in Greenhouse Vegetable Fields in Beijing |
| LIU Kan，GUO Li-na，JIA Yu-xuan，XIA Xin-yue，LI Tong，DUAN Bi-hua，SHI Sheng-wei* |
| Key Laboratory of Urban Agriculture（North China），Ministry of Agriculture and Rural Affairs，Beijing College of Agronomy，Beijing 102206，China |
|
|
|
|
Abstract Through proceeding field investigation on the fertilizer application of 352 greenhouse vegetable fields in Beijing，this paper aimed to find out the fertilization status in greenhouse vegetable fields and existing problems，so as to estimate the potential for fertilizer reduction．The results showed that the nutrients input to greenhouse vegetable fields in Beijing（nutrients over standard rate＞72%）were generally exceeded the recommended fertilizing amount．There were significant differences in fertilizing amount between different kinds of greenhouses．The average input quantities of nitrogen，phosphorus and potassium（N，P2O5 and K2O）were 858，409，572 kg · hm-2 in solar greenhouses，which were significantly higher than those in plastic-covered tunnels．The average input quantities of N，P2O5 and K2O were 593，317，438 kg · hm-2，respectively．Nutrients in greenhouse vegetable fields mainly came from basally applied organic fertilizers．The total nutrients input amount in solar greenhouses and plastic-covered tunnels were 66% and 52%，respectively．There was huge potential in fertilizer reduction for different vegetable varieties．Potentials of fertilizer reduction for total quantities of N，P2O5 and K2O were 61%-62% for brassica，43%-48% for cucumber，and 18%-47% for eggplant，respectively．The input ratios of N∶P2O5∶K2O were 1∶0.47∶0.66 and 1∶0.53∶0.73 in solar greenhouses and plastic-covered tunnels，respectively，indicating that the potassium fertilizer input was relatively insufficient．We suggested to accelerate the popularization and application by integration of water and fertilizer technology in greenhouse vegetable production and reinforce technical guidance for greenhouse vegetable fertilization，especially to reduce N and P2O5 inputs in solar greenhouses，so as to avoid waste of natural resources and environmental pollution caused by excessive fertilization．
|
|
Received: 12 September 2019
|
|
|
|
|
|
|
