Nutrient application method based on nutrient uptake curve of florist crops in hydroponics.

为修正菊花和桔花的氮素吸收和生长曲线，绘制了菊花和桔花切花的氮素施用量标准曲线。分别绘制了菊花夏初花期“Seiun”和秋初花期“Shuhounochikara”两个种植期的标准曲线，以及百合花全年生产的两种氮肥施用量曲线。由于采用NFT系统沿标准曲线施氮的方法在两个种植期切花质量好，因此该曲线适用于实际的菊花溶液培养生产体系。在同一试验中，确定了N、P、K、Ca、Mg的最佳施用量分别为100、10-15,100-120、35-40和8-10。对喷雾型菊花也适用营养施肥法。另一方面，利用施氮曲线法进行百合花的溶液培养生产并不完全成功，目前还不能适应生产。因此，有必要对该方法进行重新研究，以提出合适的桔花溶液培养装置。在实验的基础上，建立了计算机营养供给系统，并在计算机上编制了基于标准施用曲线的BASIC程序，但在实际应用前还需要进一步完善。

Standard curves for the rate of nitrogen application for cut flower production of chrysanthemum and lisianthus (Eustoma grandiflorum) were made to modify their nitrogen uptake and growth curves.The standard curves were made for two cropping periods of early summer flowering 'Seiun' and autumn flowering 'Shuhounochikara' of chrysanthemum, and two types of nitrogen application curves for the year round production of lisianthus.As the method of supplying nitrogen along the standard curve for chrysanthemum using NFT system produced good quality cut flowers in the two cropping periods, the curves were suitable for practical solution culture production system of chrysanthemum. In the same experiment, it was determined that optimum application ratios for N,P,K,Ca and Mg were 100,10-15,100-120,35-40 and 8-10, respectively. The nutrient application method was also adapted for spray type chrysanthemum.On the other hand, the solution culture production for lisianthus by the method of nitrogen application curve was not completely successful therefore, so far it can not be adapted for production. It is therefore neccessary to reinvestigate the method, in order to come up with appropriate apparatus of solution culture in lisianthus.A computerized nutrient supply system and a BASIC program running on the computer using the standard application curves were made on an experimental basis, but they were require futher perfection before being being put to practical application.