GROWTH OF ANANAS COMOSUS (L.) MERR. AT DIFFERENT LEVELS OF MINERAL NUTRITION UNDER GREENHOUSE AND FIELD CONDITIONS. I. PLANT AND FRUIT WEIGHTS AND ABSORPTION OF NITRATE AND POTASSIUM AT DIFFERENT GROWTH INTERVALS

GROWTH OF ANANAS COMOSUS (L.) MERR., AT DIFFERENT LEVELS OF MINERAL NUTRITION UNDER GREENHOUSE AND FIELD CONDITIONS. II. CHEMICAL COMPOSITION OF THE TISSUES AT DIFFERENT GROWTH INTERVALS

“…Results from plants grown in the field from October 1943 to August 1945, with 500 pounds of nitrogen, as ammonium sulphate, and 0, 200, 400, 800, 1600 and 3200 pounds of K20, as potassium sulphate, in solution, are given in table I; also, mean fruit and slip weights of same were reported in figure 5 C of a previous publication (13).…”

“…Sugar concentrations in cultures D and E, with twofold and fourfold as great nitrate concentrations, respectively, as C, differed very little from the latter, presumably due to small differences in nitrate intake and rates of assimilation between the former and latter cultures (13 , and J than in C or H caused, in the former, slightly greater rates of plant growth and nitrate absorption and sugar utilization in the non-chlorophyllous basal leaf sections than in the latter, but at no time complete exhaustion of nitrate in the nutrient solutions.…”

“…From the point of view of general observation, the plants of the different cultures varied in stem, leaf, and root weights (13). Also, the leaves had different degrees of greenness, or amounts of mottling or necrosis at the terminal regions.…”

Pineapple

“…Growth has been indexed by whole plant weights, but perhaps more frequently by the weight and/or approximate area of the D-leaves Gaillard, 1969Gaillard, , 1970Py et al, 1968;Py, 1959Py, , 1968Su, 1969;Black, 1962). However, most pineapple growth studies have been conducted on the basis of fresh weights Krauss, 1937, 1938;Sideris and Young, 1950;Py, 1959) so there is little opportunity to compare dry matter production rates of pineapple grown in different environments. One study of pineapple growth based on dry matter yields has been reported (Tay and Tan, 1971) and dry weights have been estimated from plant moisture contents of a subsample and the fresh weights of test plants (Joshi et al, 1965).…”