The Influence of Mineral Nutrition on the Root Development of Trees

Philipson, J. J.; Coutts, M. P.

doi:10.1093/jxb/28.4.864

Cited by 50 publications

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“…Unfortunately, we could not distinguish roots of the two species from the mixed plots, and so do not know which contributed to the dense root mat. However, Sitka spruce often produces a greater mass of fine roots in nitrogen deficient soil than in fertilized soil (Philipson & Coutts, 1977;Persson, 1980;McKay & Malcolm, 1988); this could explain the more dense root mat under the mixed subplot, as the pure spruce received nitrogen twice (1976 & 1988) whereas the mixed subplot was fertilized with nitrogen only once (1976).…”

Section: Discussionmentioning

confidence: 99%

A study of the oxygen regime and rooting depth in deep peat under plantations of Sitka spruce and lodgepole pine

Ray

Schweizer

1994

Soil Use and Management

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Abstract. Rooting depth, watertable depth and oxygen regime were measured in plots of Sitka spruce, lodgepole pine and a 50% mixture of each species planted on a deep unflushed blanket peat. The water‐table was about 10 cm deeper and roots occurred about 2 cm deeper under the pine than under the spruce or the mixture. In addition the mean concentration of oxygen at 50 cm depth was significantly larger under the pine and the mixture than under the spruce, showing that the rapid early growth of the pine had started to dry the peat. There was no evidence of any improvement in the growth of the spruce in the mixture compared to the pure Sitka spruce, suggesting that the expected nursing benefit had not occurred.

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Section: Discussionmentioning

confidence: 99%

A study of the oxygen regime and rooting depth in deep peat under plantations of Sitka spruce and lodgepole pine

Ray

Schweizer

1994

Soil Use and Management

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“…Parfois les synergides deviennent tellement proéminantes dans le micropyle qu'elles forment des coecums comparables à des haustoriums dont la paroi porte des proliférations pariétales, favorisant l'entrée d'éléments nutritifs dans le sac embryonnaire (M.N. Philipson, 1977Philipson, , 1978Philipson, , 1981.…”

Section: Les Fonctions Dévolues à L'appareil Filiformeunclassified

Macrosporo- et Macrogaméto- Genèses, Fécondation, Embryogenèse et Albuminogenèse chez les Angiospermes

Fougère-Rifot

1987

Bulletin de la Société Botanique de France. Actualités Botaniqu

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Rérumé.-L'attention est attirée sur les acquisitions récentes touchant à la sporo-et gamétogenèse femelles, la double fécondation et ses conséquences.Certaines particularités propres à l'édification de l'appareil filiforme, aux synergides, aux proliférations pariétales garnétophytiques, à la résorption des parois intragamétophytiques et à la lyse nucellaire sont examinées à l'échelle ultrastructurale et cytochimique.Sont également étudiés le transfert des gamètes mâles dans les gamètes femelles, la formation de l'albumen et les problèmes soulevés par la triploïdie de ce tissu.Summary.-This paper lays stress on recent advances on megasporo-and megagametogenesis, double fertilization and its results.Sorne peculiarities relative to filifonn apparatus, synergids, garnetophytic wall ingrowths, intragametic cell walls thinning down and cellular lysis are investigated with electron microscopy and cytochemistry.Transfer of the male gamete material to the eff cell and central cell is investigated. Endosperm formation and problems raised by the triploidy of this tissue are also analysed.

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“…Shoot:root ratio of 'Helleri' holly increased as the number of weekly applications of a 300 ppm N, 167 ppm P and 247 ppm K soluble fertilizer in creased (6), and at increasing rates of a 20N-8.7P-16.7K soluble fertilizer (13). Root growth of spruce was most stimulat ed by N, less stimulated by P, and not stimulated by K (10). N and P together had a greater effect than either alone.…”

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confidence: 98%

Influence of Nitrogen and Phosphorus on Shoot:Root Ratio of Ilex crenata Thunb. ‘Helleri’1

Yeager

Wright

1981

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Higher N rates applied to Ilex crenata‘ Helleri’ holly liners grown in the greenhouse increased shoot growth but-decreased root growth resulting in a greater shoot:root ratio. Higher N rates reduced the time required for a shoot growth flush to occur. Ρ at 85-500 ppm had no effect on shoot or root growth. Continued growth of liners at 50 ppm N lowered the shoot:root ratio due to stimulation of root growth while 300 ppm N caused the shoot:root ratio to increase due to increased shoot growth.

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The Influence of Mineral Nutrition on the Root Development of Trees

Cited by 50 publications

References 0 publications

A study of the oxygen regime and rooting depth in deep peat under plantations of Sitka spruce and lodgepole pine

A study of the oxygen regime and rooting depth in deep peat under plantations of Sitka spruce and lodgepole pine

Macrosporo- et Macrogaméto- Genèses, Fécondation, Embryogenèse et Albuminogenèse chez les Angiospermes

Influence of Nitrogen and Phosphorus on Shoot:Root Ratio of Ilex crenata Thunb. ‘Helleri’1

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