Effects of irrigation and nitrogen fertilizing on yield and quality of tomatoes [Lycopersicon esculentum] cultured in a forcing house by drip fertigation
2005
Araki, M.(Fukuoka-ken. Agricultural Research Center, Chikushino(Japan)) | Hayashida, T. | Ide, O.
This study was conducted to clarify the dynamics of nitrogen and the effect of irrigation and nitrogen fertilization on the yield and quality of forcing 'HAUSUMOMOTARO' tomatoes by drip fertigation. At the same time, the indexes of nutritional diagnoses for controlling fertigation were obtained. The results were as follows. (1) The amount of inorganic nitrogen in the plowed soil of the field at the time of planting was 45kg per 10a. The mineralized nitrogen while culturing the tomatoes was estimated at only 4kg per 10a. (2) When the amount of nitrogen applied by drip fertigation was reduced by 50% and the amount of irrigation was equal to a conventional culture, the yield and quality of the tomatoes were similar. Also, the amount of nitrogen uptake by the tomatoes by drip fertigation was 32kg per 10a. (3) While forcing tomato was cultured by drip fertigation from December to May, the amount of irrigation in the range of 100 to 500mL plant(-1) day(-1) and applied nitrogen in the range of 10 to 45mg plant(-1) day(-1) were appropriate. (4) The index of the nitrate nitrogen content for diagnosing the soil was 5 to 10mg per 100g.
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