INFLUENCE OF LEAF POSITION, MEDIUM TYPE AND BORON ACCUMULATION ON LEAF TIPBURN IN Chlorophytum comosum (THUNB) JAQUES "VARIEGATUM". | ||||
| Journal of Plant Production | ||||
| Article 19, Volume 27, Issue 4, April 2002, Page 2361-2376 PDF (5.22 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.253985 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| B. A. Abdel-Maksoud, | ||||
| Department of Floriculture, Faculty of Agriculture, Alexandria University Alexandria, Egypt. | ||||
| Abstract | ||||
| During two successive seasons, complete randomized design experiments were conducted under natural conditions in plastic house on one-year-old Chlorophytum comosum (Thunb) Jaques "Variegatum" plants to: (1) study the effect of Ca (as calcium hydroxide), P (as treble superphosphate, 48% P20s), F (as sodium fluoride) and B (as boric acid, 17% B) on the leaftipburn in Chlorophytum. The rates were 0, 2, 4 and 6 g/l. of medium for Ca and P; 0, 3, 6 and 9 mgll. F in solution and 0,5,10 and 15 mgll. Bin solution. Plants were grown ina mixture of 1 soil : 1 peat : 1 perlite (by volume) or in sphagnum peat moss. Ca significantly raised the pH and reduced the leaf tipburn area in both media. P significantly reduced the pH of the mixture and raised it in sphagnum peat, but did not reflect a consistent effect on the leaf tipburn. F significantly raised the pH both media in the 1 st season and did not affect the leaf tipburn. At 10 and 15 mgll. B the pH of both media was significantly reduced, while the burning of the tip on the oldest leaves was significantly developed with increasing B rates. The concentrations of the tested elements in the leaf tissues showed an increasing trend with increasing elements in the medium. As B accumulation increased in the oldest leaves, the tipburn area increased. Leaf tissues of every treatment contained Na which may be related to the lamina tipburn. (2) study the B distribution through the plant foliage using plants grown in sandy culture treated with (a) a complete Hoagland and Arnon' solution; (b) a second without B or (c) a third containing 20x the recommended amount of B. With increasing B amount in the solution the B leaf tissue content and the tip burn area on the oldest leaves were increased. The uppermost leaves did. not exhibit lamina tipburn. B accumulation in the oldest leaves was more than that in the uppermost ones. B distribution in the various parts of the oldest leaves was not uniform and most of B accumulated in the distal parts, which resulted in the appearance of tipburn on it. | ||||
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