EFFECT OF FERTILIZERS ON THE CONTENT OF NITRATE IN PINEAPPLE FRUIT

In order to prevent the excess nitrate accumulation in pineapple fruit, a field experiment in RCB design with four replications for pineapple (Smooth Cayenne) cultivation was carried out in Gray Podzolic soil (Ustoxic Dystropepts) with the applications of N-P₂-O₅ K₂O, 12–12–15 (50 g plant^-1 season^-1, as a control) and the combinations of N-P₂O₅-K₂O with either Mo (5.86, 11.72 mg plant^-1), Mn (11.72 mg plant^-1), Mg (3,000mg plant^-1), KCl (5 g plant^-1), or city compost (25 ton. ha^-1). At the harvesting stage, nitrate content, % brix, and pH of pineapple fruits as well as Mo content in white basal tissue of D-leaf were determined.
There was a trend of a reduction of nitrate content in pineapple fruit according to the applications of compost, KCl, Mg and Mo.
Especially, an increase in Mo content in D-leaf Molybdenum at the rate of 11.72 mg plant^-1 significantly reduced nitrate accumulation on pineapple fruit, without any effect on % brix and pH in pineapple fruit.

III International Pineapple Symposium

P. Chongpraditnun, P. Luksanawimol, P. Limsmuthchaiporn, S. Vasunun

fertiliser, nitrate, pineapple

https://doi.org/10.17660/ActaHortic.2000.529.27