Assimilation of Ammonium and Nitrate by Pineapple Plants Grown in Nutrient Solutions and Its Effects on Nitrogenous and Carbohydrate Constitutents

Effects of Nitrogen on the Nitrogenous Fractions of Ananas comosus (L.) Merr.

“…In agreenment with previous studies (30), amnide nitrogren in the tissues of the high-N cultures, was greater in the ammoniium-N than nitrate-N series ( fig. 3).…”

“…The low-N cultures in the same series lacked in nitrate because of the small external supply. Of course the cultures in the ammonium-N series were completely devoid of nitrate, which is in agreement with previous finidings (30,33,34 …”

“…The nmuclh gyreater total-N values in the amnlllliumll-N than in the nitrate-N series inidicate a greater rate of absorption of NH4+ thani N03-, which was also fouild in previotus stuidies (30). (fir.…”

“…The system employed for the nomenelature of the leaves, the technique for the sectioning of the various organs, the preparation of tissuies and chemical methods for their analysis were reported in previous publications (29,30). Results …”

“…Former studies (30,31,32) have indicated that the leaves of A. cokfnosts grown in substrata containingc ammoniiumii were greener, broader and miiore succulent by comparison with those grown in nitrate. Also, the tisslues of the former contained no nitrate but greater amounlts of soluble organiic-'N thani the latter.…”