Abstract: To get high flower production of tuberose,growing media and NPK fertilizer proportion was determined accurately by polynomial regression quadratic equation (PRQE) in four elements.The partial derivatives from polynomial regression equation (Y₆) was utilized for estimating the maximum production of tuberose flower.Results revealed coding level X₁=-1.695, X₂=-1.122,X₃=0.311 and X₄=1.151,which are converted into doses of trial factors,are KD-1-Hydrophilic gel/sandy-soil (HG/SS)=0.652%,(NH₄)₂SO₄=14.39 (g穖^-3),Ca(H₂PO₄)₂稨₂O=25.75 (g穖^-3),and K₂SO₄=25.89 (g穖^-3).Therefore,Ymax =28.79 (number of flower穖^-2).Results revealed that plant height was significantly influenced by the application of three major nutrients.However,number of leaves/plant increased non-significantly with the increasing level of NPK and HG/SS.Number of bulks/clump was also influenced by N,P and K as well as HG/SS.Application of higher levels of NPK showed profound effect on increasing flower production (number of spikes穖^-2),and number of florets/spike.Therefore,higher doses of NPK are recommended for higher production of flower.

Key words: processing tomato, drip irrigation, N application, physiological development time, N utilization rate, dynamic simulation model.