A PRELIMINARY STUDY ON TESTING AND INTERPRETATION OF NUTRIENT SOLUTION UNDER MODERN GREENHOUSE CULTIVATION

Chen Chunhong Yang Zhijie Zhu En Zhou Qiang Lin Tianjie(Shanghai Academy of Agricultural Sciences, Shanghai 201106;Shanghai Agricultural Technology Extension and Service Center, Shanghai 201103)

Testing and interpretation ; Nutrient solution ; Drain water; Water source;Irrigation management

A preliminary study on the testing and interpretation of the nutrient solutionunder modern greenhouse cultivation was carried out in Shanghai suburbs. It was found thatthe existing instruments and equipment of our Environmental Science Research Institutewere sufficient for analyzing most of nutrient elements, but if more accurate and fast analytical results for all the nutrient elements were required, more new instruments should be need.The testing results of the water source, irrigation nutrient solution, and drain water from thesubstrate showed that rain water is the best water source for drip irrigation, city water andunderground water are good supplementary water source, but river water need to be pretreated before use as irrigation water. In general, the water and nutrient management of Sunqiaoand Donghai greenhouses was good, except for the supply of P and Mn was a little low. ForNanhui greenhouse, owing to the blocking of the irrigation system, the nutrient contents inirrigation water and drain water were low. The high pH values of the source, irrigation, anddrain water were the common problems for the three Pudong greenhouses, more attentionshould be paid to the pH adjustment. In addition, more attention should also be paid to themaintenance of the irrigation equipment.