Simulation of leaf area and dry matter production of tobacco leaves based on product of thermal effectiveness and photosynthetically active radiation

The objective of this work was to study morphogenic characteristics, and dry matter production of roots and shoots of marandu palisadegrass (Brachiaria brizantha cv. Marandu) submitted to combinations of nitrogen and potassium, in a nutritive solution, employing silica as substrate. The experiment was carried out in a greenhouse during the summer. It was used a 5² fractionated factorial scheme with 13 combinations of nitrogen and potassium, which were distributed in a randomized block design, with four replications. The nitrogen × potassium interaction was significant for the number of tillers and leaves, for leaf area, for shoots and root section dry mass, for total length and surface and specific length and surface in the roots. Production of aerial part dry mass positively correlated with the number of tillers and leaves and grass leaf area. Nitrogen rates modulated the root system development, and the root specific length and surface decreased when high rates of nitrogen and potassium were supllied. Nitrogen and potassium influence Marandu palisadegrass morphogenic characteristics, which are determinant for grass dry matter production.

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Depressed fodder quality and increased oestrogenic activity of lucerne infected with Pseudopeziza medicaginis

Australian Journal of Agricultural Research ◽

10.1071/ar9801103 ◽

1980 ◽

Vol 31 (6) ◽

pp. 1103 ◽

Cited By ~ 8

Author(s):

WC Morgan ◽

DG Parbery

Keyword(s):

Protein Content ◽

Leaf Area ◽

Crude Protein ◽

Dry Matter ◽

Dry Matter Production ◽

Crude Protein Content ◽

Fodder Quality ◽

Matter Production

As well as reducing dry matter production of lucerne, infection of 15 % of the leaf area by Pseucbpeziza medicaginis reduced digestibility by 14% and crude protein content by 16%. Infection caused oestrogenic activity in green lucerne.

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Growth and yield studies of Lupinus angustifolius and L. albus in Victoria

Australian Journal of Experimental Agriculture ◽

10.1071/ea9820076 ◽

1982 ◽

Vol 22 (115) ◽

pp. 76 ◽

Cited By ~ 5

Author(s):

KA Boundy ◽

TG Reeves ◽

HD Brooke

Keyword(s):

Grain Yield ◽

Leaf Area ◽

Dry Matter ◽

Yield Component ◽

Early Flowering ◽

Growth And Yield ◽

Dry Matter Production ◽

Sowing Time ◽

Dry Matter Partitioning ◽

Matter Production

The effect of serial planting on dry matter production, leaf area, grain yield and yield components cf Lupinus angustifoiius (cvv. Uniwhite, Uniharvest and Unicrop) and L. albus (cv. Ultra) was investigated in field plots at Rutherglen in 1973 and 1974. Delayed planting reduced dry matter production of all cultivars, and leaf area for Ultra. Differences in dry matter partitioning were observed between the late flowering Uniharvest, and the early flowering Unicrop and Ultra. In Uniharvest, delayed plantings resulted in a greater proportion of total dry matter being produced during the flowering phase, whereas the reverse was true for Unicrop and Ultra. The later flowering cultivars showed marked grain yield and yield component reduction with later sowing. Yields were reduced by 160.6 kg/ha and 222.5 kg/ha for each week's delay in sowing Uniharvest and Uniwhite, respectively. This effect was offset in the early flowering cultivars by greater development of lateral branches. In addition, when Unicrop and Ultra were planted in April, pod and flower abortion on the main stem resulted from low temperatures at flowering time. Optimum sowing time was early April for Uniwhite and Uniharvest, and early May for Unicrop and Ultra. Excellent vegetative growth under ideal moisture conditions highlighted the poor harvest indices of lupins and the scope for genetic improvement in the genus.

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AN ANALYSIS OF DRY MATTER PRODUCTION OF DOUGLAS-FIR SEEDLINGS IN RELATION TO TEMPERATURE AND LIGHT INTENSITY

Canadian Journal of Botany ◽

10.1139/b67-223 ◽

1967 ◽

Vol 45 (11) ◽

pp. 2063-2072 ◽

Cited By ~ 30

Author(s):

Holger Brix

Keyword(s):

Light Intensity ◽

Leaf Area ◽

Dry Matter ◽

Douglas Fir ◽

Dry Matter Production ◽

Dry Matter Distribution ◽

Pronounced Increase ◽

Light Intensities ◽

Matter Production ◽

Net Assimilation

Seedlings of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) were grown in growth chambers under all combinations of three temperatures (13, 18, and 24 °C) and three light intensities (450, 1000, and 1800 ft-c). Dry matter production of leaves, stem, and roots was determined at 65 and 100 days after germination. The leaf area produced per unit of leaf dry weight and the dry matter distribution to the plant organs was measured. Net assimilation rates between the ages of 65 and 100 days were calculated. Rates of photosynthesis per unit of leaf were determined at different light intensities and temperatures, and rates of respiration of plant top and of roots were found for different temperatures.Increasing light intensity affected dry matter production in two opposing ways: (i) it increased the rate of photosynthesis per unit leaf area, and (ii) it decreased the leaf area added per unit of dry matter produced. A pronounced increase in growth with increase in temperature from 13 to 18 °C was a result of a temperature influence on production of leaf area rather than the effect of photosynthesis per unit of leaf. Net assimilation rates decreased with increase in temperature at all light intensities.

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Effects of Time of Sowing and Phosphamidon (Dimecron) on Cowpea (Vigna unguiculata)

Experimental Agriculture ◽

10.1017/s0014479700009492 ◽

1974 ◽

Vol 10 (2) ◽

pp. 87-95 ◽

Cited By ~ 6

Author(s):

B. A. C. Enyi

Keyword(s):

Grain Yield ◽

Leaf Area ◽

Vigna Unguiculata ◽

Dry Matter ◽

Dry Matter Production ◽

Matter Production ◽

Area Development ◽

Leaf Area Development

SUMMARYApplication of dimecron to cowpea plants increased grain yield, its effect being more pronounced in widely spaced plants and those planted in March. Dimecron increased grain yield by encouraging greater leaf area development, by increasing the number of flowering inflorescences and the number of pods set per inflorescence, and by decreasing the number of shrivelled pods. March planting encouraged greater dry matter production than January and May planting. Dimecron application decreased the number of Ootheca beningseni, reduced the proportion of leaf damaged by these insects, and reduced the number of plants infested with aphids and Acidodis larvae.

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Effects of Nitrogen, Phosphorus, Potassium and Magnesium on Growth of the Oil Palm

Experimental Agriculture ◽

10.1017/s0014479700005470 ◽

1972 ◽

Vol 8 (4) ◽

pp. 347-353 ◽

Cited By ~ 14

Author(s):

R. H. V. Corley ◽

C. K. Mok

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Dry Matter ◽

Fertilizer Application ◽

Dry Matter Production ◽

Matter Production ◽

Oil Palms ◽

Net Assimilation ◽

Nitrogen Phosphorus ◽

Bunch Yield

SUMMARYPotassium application appeared to increase dry matter production and yield of oil palms, primarily by increasing leaf area, while nitrogen increased both leaf area and net assimilation rate. Responses to phosphorus and magnesium were harder to interpret. Production of vegetative dry matter attained a fairly constant level at the higher rates of fertilizer application, while the ratio of bunch yield to total dry matter production was little affected by fertilizer treatments. The importance of these results for oil palm breeding, and their possible value in diagnosing fertilizer requirements, are briefly discussed.

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