METHOD FOR HYDROPONICS OF SOIL CULTURE, NUTRIENT SOLUTION CONTROL SHEET FOR HYDROPONICS OF SOIL CULTURE AND NUTRIENT SOLUTION CONTROL SYSTEM FOR HYDROPONICS OF SOIL CULTURE

摘要

PROBLEM TO BE SOLVED: To provide a method for hydroponics of soil culture capable of supplying a nutrient solution in which a proper amount of a fertilizer is dissolved to crops with the growth of crops and controlling an excessive fertilizer.;SOLUTION: This method for hydroponics of nutrient solution comprises supplying a nutrient solution obtained by dissolving a fertilizer in raw water to a crop land and cultivating crops. The method has a soil analysis process for measuring the residue of specific fertilizer elements remaining in the crop land before cultivating crops and a cultivation process for predetermining the amount of the specific elements of the same kind per fixed time required for every growth stage of crops before cultivating crops, dissolving a fertilizer in accordance with the predetermined amount to prepare a nutrient solution and cultivating crops. In the cultivation method, the method for hydroponics of nutrient solution characterized in that in a period in which the total amount of the predetermined amount of the specific fertilizer elements added from the beginning of the cultivation corresponds to the residue of the specific fertilizer elements obtained by the soil analysis process, a nutrient solution having 10-50 ppm total nitrogen concentration is supplied so that the amount of the raw water or the amount of applied fertilizer is smaller than the predetermined amount and after the period, a nutrient solution prepared by dissolving the fertilizer in accordance with the predetermined amount and crops are cultivated. The method is provided as a dissolving means.;COPYRIGHT: (C)2002,JPO