Studies on Fertilization Strategy and Related Indexes for Tomato Facility Soil Cultivation
GAO Jie-Yun, WANG Li-Ying, YAN Zheng-Juan, JIA Wei, CHEN Qing
1 College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; 2 Institute of Agricultural Resource and Environment, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang ,050051Hebei，China
Abstract：Due to diverse facility vegetable planting seasons, growth periods and yield levels, its high income character has resulted in excessive fertilization in facility cultivation, which has led to soil nutrient over accumulaion, soil acidification, and secondary salinization．Very high ariation of soil available nitrogen content in rootzone limited the use of soil mineral nitrogen testing and nitrogen recommendation during the whole growing period．Taking greenhouse tomato Lycopersicon esculentum Mill.） in northern China as an example and based on the data from our experiments and published literatures, this paper provides strategy of specific formula for fertilization in soil-bound greenhouse tomato, according to fertilization and nutrient uptake characteristics, including determining the total nutrient requirements of different seasons’ tomato by target yield; determining the chemical fertilizers（ N, P and K） quantities based on optimum rate of organic manure and soil nutrient levels; selecting special fertilizer formulas for tomato in different growth periods based on
the characteristics of nutrient uptake and fertilization schedule in the whole growth period of tomato, which was matched into irrigation schedule．The two-year demonstration results of the recommended strategy and related index in Beijing suburbs showed that the inputs of N, P2O and K2O fertilizer, and water were saved by 42.7%, 59.1%, 41.5% and 21.0%, respectively as compared with the conventional practices, while the tomato yields increased by 13.4% on average with recommended fertilization strategies.