On November 13th-14th, the Institute of Agricultural Resources and Environment of HAAFS invited researcher Wim Voogt from Wageningen University in the Netherlands, professor Rodney Thompson from Almeria University in Spain, and associate professor Li Xin from China Agricultural University to conduct academic exchanges. Two European experts gave academic reports on the topics of "Fertilization management in Dutch soil - and soil cracking systems towards maximum sustainability" and "Improving nutrition and irrigation management in greenhouse vegetable production in southern Spain".

Mr. Wim shared over 40 years of scientific research achievements and reported on how to achieve precise water and fertilizer management in the Dutch greenhouse soil and soilless (substrate) vegetable planting system. Wim believes that the current nutrient supply plan for greenhouse crops should improve irrigation water quality through comprehensive optimization of fertilization parameters (soil conductivity, cation exchange capacity), establish a closed-loop fertilization system, and establish a modern greenhouse water and fertilizer management system to achieve sustainable resource utilization. Wim gave a brilliant explanation on how to use conductivity parameters to coordinate nutrient concentration and stoichiometry in irrigation water, root microdomains, and drainage systems, thereby achieving maximum water and nutrient utilization efficiency.

Professor Thompson reported on how to improve water and nutrient management in the Spanish greenhouse vegetable system. Thompson first introduced the problems in the current water and fertilizer management of greenhouse facilities in Spain, and pointed out that although the current drip irrigation coverage rate of greenhouse facilities has reached 100%, the problems of excessive fertilization and imbalance are prominent, and there is an urgent need to improve the empirical water and fertilizer management model. Thompson took water and nitrogen management as an example and shared the nutrient expert decision-making system (DSS) developed by the team after 14 years of research. He emphasized that water and fertilizer management relies on high-frequency and accurate nutrient sensor detection feedback to recommend fertilization, achieve real-time diagnosis of nutrient deficiencies, accurately match water and fertilizer supply, and significantly improve nitrogen fertilizer utilization efficiency.

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