Open AccessTHE EFFECT OF pH AND OE CERTAIN MINOR ELEMENTS ON THE GROWTH OE PINEAPPLES IN WATER CULTURES
Author(s) -
N. A. Schappelle
Publication year - 1942
Publication title -
the journal of agriculture of the university of puerto rico/the journal of agriculture of the university of puerto rico
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 10
eISSN - 2308-1759
pISSN - 0041-994X
DOI - 10.46429/jaupr.v26i3.13585
Subject(s) - chlorosis , manganese , zinc , horticulture , chemistry , copper , botany , biology , organic chemistry
1. A pH value of 4.0 to 4.5 was found to be favorable for the growth of the pineapple plant in water cultures. 2. At pH values above 5.0 chlorosis became increasingly severe. 3. The higher pH values promoted excellent root development while those below 4.0 caused a short, stubby root system. 4. Manganese and zinc tended to cause chlorosis which is due to the nonfunctioning of iron in the plant. 5. Aluminum and boron tended to counteract the effect of the manganese and zinc and tended to cause a normal condition of the pineapple plants. 6. Copper added at the rate of 2 p.p.m. controlled a root fungus that caused stunting of the pineapple plants. 7. No correlation between pH value or minor element composition and gummosis of the fruit could be determined.