Fertilizer application according to plant
nutrient status in soil and plant of each area
is the most efficiency of soil and fertilizer
management. Comparison of rubber fertilizer
application according to soil nutrient status
and traditional method in 2 provinces of
Thailand ; Surat Thani and Nakomsrithammaraj
showed that the former method gave 85 kg
rai't yeart higher yield than the latter method,
and increase 25.64 % of the net profit (21).
Fertilizer application according to soil
nutrient status in corn cultivation gave higher
yield than the fertilization by general recommendation
whereas the cost of fertilizer was
not'significant different (29). ln Sugar can, it
was found non-significant different of the
yield, but % brix (soluble solid), %pol
(percent by weight of sucrose in sugar can
juice) and % purity of sugar can juice were
higher in fertilization by plant nutrient status
considering than in general recommendation
(30). ln addition, the results of rice
cultivation showed 18 o/o of yield increasing