Physiological studies of competition in Zea mays L: III. Competition in maize and its practical implications for forage maize production

1969 ◽  
Vol 72 (2) ◽  
pp. 203-215 ◽  
Author(s):  
Maurice Eddowes
Keyword(s):  
Soil Moisture ◽  
Dry Matter ◽  
Total Yield ◽  
Field Capacity ◽  
Dominant Factor ◽  
Dry Matter Accumulation ◽  
Competitive Balance ◽  
Available Nitrogen ◽  
Forage Maize ◽  
Early Stages

SUMMARYCompetition among maize plants in the vegetative stage of growth was postponed by application of nitrogen to the seed bed and by maintaining soil moisture near field capacity. The amount of available nitrogen was a critical factor in determining the effect of the competitive balance between nitrogen and light on maize yield. The supply of either affected the capacity of the crop to utilize the other, but ultimately light became the dominant factor.Soil moisture deficits of up to 1.0 in from field capacity, in the early stages of vegetative growth, did not reduce dry-matter accumulation and uptake of nitrogen, but in the absence of weed competition and post-planting cultivation soil moisture losses in the early stages of crop growth may be small.In 1966, maize responded quicker to surface applied than to deep-placed nitrogen and utilized the surface applied nitrogen for dry-matter accumulation more effectively.Provided that there was initially an adequate supply of nitrogen in the seed bed, there appeared to be no advantage to total yield from application of nitrogen top dressings to maize. In the West Midlands, under conditions of adequate nutrient and soil moisture supply, the optimum plant population for commercial production of forage maize was about 40000 per acre.

Effects of partial rootzone drying and rootstock vigour on dry matter partitioning of apple trees (Malus domesticacvar Pink Lady)

2011 ◽  
Vol 150 (1) ◽  
pp. 75-86 ◽  
Author(s):  
R. LO BIANCO ◽  
G. TALLUTO ◽  
V. FARINA
Keyword(s):  
Soil Moisture ◽  
Deficit Irrigation ◽  
Dry Matter ◽  
Field Capacity ◽  
Dry Matter Accumulation ◽  
Apple Trees ◽  
Dry Matter Partitioning ◽  
Use Efficiency ◽  
Partial Rootzone Drying ◽  
Conventional Irrigation

SUMMARYThe effects of partial rootzone drying (PRD) and rootstock vigour on dry matter accumulation and partitioning among leaves, shoots, fruits, frame and roots of apple trees (Malus domesticaBorkh. cvar Pink Lady) were investigated in 2005 near Caltavuturo, in Sicily. In a first field trial, trees on MM.106 rootstock were subjected to: conventional irrigation (CI), maintaining soil moisture above 0·80 of field capacity; PRD irrigation, where alternating sides of the rootzone received 0·50 of the CI irrigation water; and continuous deficit irrigation (DI), where 0·50 of the CI water was equally applied to both sides of the rootzone. In a second trial, trees on M.9 or MM.106 were subjected to CI and PRD irrigation. In trial 1, dry matter accumulation was markedly reduced by DI irrigation and to a lesser extent by PRD; PRD trees partitioned 20% less to leaves, 31% less to fruits and 24% more to woody components than CI trees; DI trees partitioned 14% less to current shoots and 18% more to fruits than CI and had the highest fruit:leaf ratio. In trial 2, there was no interaction between rootstock and irrigation treatments. MM.106 induced greater leaf, shoot, frame and root dry weights (DWs) than M.9, resulting in more vegetative growth and larger trees. PRD reduced leaf, shoot, frame and fruit DWs, while root DWs were similar to CI, and thus PRD trees were 18% smaller than CI trees. Neither rootstock nor irrigation affected dry matter partitioning among organs or root:canopy ratio, whereas PRD trees or trees on MM.106 showed better water use efficiency than CI and M.9, respectively. The results show that PRD trees did not activate drought tolerance strategies in terms of dry matter allocation that could improve acquisition of water resources, regardless of rootstock. PRD irrigation increased above-ground dry matter partitioning towards woody components at the expense of leaves and fruits.

STUDIES ON THE BIOLOGY OF WILD OATS. II. GROWTH.

1977 ◽  
Vol 57 (3) ◽  
pp. 811-817 ◽  
Author(s):  
M. P. SHARMA ◽  
W. H. VANDEN BORN ◽  
D. K. MCBEATH
Keyword(s):  
Soil Moisture ◽  
Light Intensity ◽  
Soil Ph ◽  
Dry Matter ◽  
Field Capacity ◽  
High Light Intensity ◽  
Dry Matter Accumulation ◽  
Initial Growth ◽  
Nitrogen And Phosphorus ◽  
Wild Oats

Dry matter accumulation by wild oats (Avena fatua L.) in a growth cabinet, after an initial lag period, took place rapidly until 8 wk after emergence. Plant height and the number of leaves per plant increased at a nearly linear rate until 6 wk after emergence. Tillering occurred mainly during the period 2–4 wk after emergence. Low light intensity and short photoperiod severely restricted growth, and delayed heading and maturity. Plants grew best at day–night temperatures of 20–12 C, though initial growth was faster at higher temperature (28–20 C). In a black loam soil, plants responded to added nitrogen and phosphorus only under high light intensity. Both soil moisture and soil pH greatly influenced the growth of wild oats. Greatest dry matter accumulation was attained when soil pH was 7.5 or 8.5 and soil moisture was maintained above 75% field capacity. Hull color of the seed had no effect on the growth of wild oat plants. Plants produced from large seeds had higher dry weights than plants produced from small seeds. Implications of these findings for the control of wild oats are discussed.

VARIATION OF SUNFLOWER GROWTH, SOIL MOISTURE AND SOIL TEMPERATURE IN RELATION TO PLANTING PATTERNS AT A HIGH LATITUDE SITE

2001 ◽  
Vol 49 (3) ◽  
pp. 273-282 ◽  
Author(s):  
M. Long ◽  
H. Eiszner
Keyword(s):  
Soil Moisture ◽  
Soil Temperature ◽  
Soil Water ◽  
High Latitude ◽  
Dry Matter ◽  
Field Experiments ◽  
Hyperbolic Model ◽  
Row Spacing ◽  
Dry Matter Accumulation ◽  
Deep Soil

HALLE-WITTENBERG, HALLE(SAALE), GERMANY Received: 13 June, 2001; accepted: 6 August, 2001 Field experiments were conducted at a high latitude site for sunflower (Helianthus annuus L.) production in central Germany (51 o 24' N, 11 o 53' E) in 1996, 1997 and 1998. The responses of sunflower development to various planting patterns differed in the duration from emergence to the middle of the linear growth period as calculated via a tangent hyperbolic model F(t)=(. +ß)×tanh[. ×(t–.)]. Final dry matter accumulation showed few differences among the planting patterns: 12 plants m –2 at 50 cm row spacing at 75 cm row spacing (RS2PD2) and 4 plants m –2 at 100 cm row spacing (RS3PD1). The actual and simulated values for final dry matter were close to 1200 g m –2 . The responses of soil moisture and temperature to planting patterns changed from the upper to the deep soil layers. In a normal year, e.g. 1997, the soil water to 150 cm depth was sufficient for sunflower growth. In a drought year, e.g. 1998, soil water deeper than 150 cm was used by sunflower crops. The soil temperature was mostly lower in RS1PD3 and RS2PD2 than in RS3PD1, particularly in the upper soil, at depths of 5 and 20 cm. The most important factor defining the responses of soil moisture and temperature to planting patterns seems to be the amount of radiation penetrating the ground, which may depend on latitude, wind and row orientation.

Influence of row spacing on growth, light and water use by sorghum

1991 ◽  
Vol 116 (3) ◽  
pp. 329-339 ◽  
Author(s):  
M. McGowan ◽  
H. M. Taylor ◽  
J. Willingham
Keyword(s):  
Water Use ◽  
Dry Matter ◽  
Ground Cover ◽  
Field Capacity ◽  
Bare Soil ◽  
Row Spacing ◽  
Dry Matter Accumulation ◽  
Matter Production ◽  
Use Efficiency ◽  
Reduced Water

SUMMARYGrain sorghum (Sorghum bicolor L. Moench) was grown in Texas in 1985 at a constant population density of c. 6·6 plants/m2 in rows 0·5, 1·0 and 1·5 m apart and with the soil profile at field capacity at planting time. Dry matter production and yield were least at the widest spacing, principally because of a reduction in number of tillers. Dry matter accumulation was in direct proportion to the amount of light intercepted and largely independent of spacing between rows, with a conversion coefficient of 1·71 g dry matter/MJ energy intercepted. The most widely spaced crop used less water but not in proportion to the extent that ground cover was reduced. Water use efficiency was also less in the most widely spaced crop, probably because of heat advection from the bare soil between rows.

scholarly journals CONSÓRCIO MILHO-BRAQUIÁRIA COM DENSIDADES POPULACIONAIS DA FORRAGEIRA NO CENTRO-SUL DO BRASIL

2018 ◽  
Vol 17 (1) ◽  
pp. 157
Author(s):  
GESSI CECCON ◽  
JUSLEI FIGUEIREDO DA SILVA ◽  
PRISCILA AKEMI MAKINO ◽  
ANTÔNIO LUIZ NETO
Keyword(s):  
Zea Mays ◽  
Dry Matter ◽  
Cropping Systems ◽  
Large Population ◽  
Total Yield ◽  
Dry Mass ◽  
Dry Matter Accumulation ◽  
Plant Populations ◽  
Brachiaria Ruziziensis ◽  
Urochloa Brizantha

RESUMO - O trabalho foi realizado com o objetivo de avaliar a produtividade de grãos e de massa de milho, solteiro e consorciado com populações de plantas de duas espécies de Brachiaria para formação de palha ou pasto. Utilizou-se o delineamento experimental em blocos ao acaso, com parcelas subdivididas e quatro repetições. As parcelas principais foram constituídas pelas espécies de Brachiaria (Brachiaria brizantha cv. Marandu e Brachiaria ruziziensis) e as subparcelas, pelas populações de Brachiaria (0, 5, 10, 20 e 40 plantas m-²), em linhas espaçadas de 0,45 m. Os tratamentos consorciados apresentam maior acúmulo de massa seca total do que o milho em cultivo solteiro. O máximo rendimento total de massa seca foi observado entre 10 e 12 plantas m-2 de B. ruziziensis, mas com maiores populações de plantas de B. brizantha. A produtividade de grãos teve redução linear de 13,39 kg ha-1 por planta m-2 de B. brizantha e redução quadrática média de 42,04 kg ha-1 por planta m-2 de B. ruziziensis.Palavras-chave: Zea mays, Urochloa, cultivo consorciado, plantio direto.INTERCROPING MAIZE-BRACHIARIA WITH FORAGE  PLANT POPULATION IN THE MID-SOUTH OF BRAZILABSTRACT - The objective of this study was to evaluate the grain and dry matter yield of maize, sole and intercropped with four plant populations of two Brachiaria species. We used the experimental design of randomized blocks, with split plots and four replications. The main plots consisted of the Brachiaria species [Brachiaria (sin. Urochloa) brizantha cv. Marandu and Brachiaria ruziziensis] and subplots consisted of the Brachiaria populations (0, 5, 10, 20 and 40 plants m-²), in same lines spaced 0.45 m. The intercrop treatments have higher total dry matter accumulation than maize monocrop. The maximum total yield dry mass was observed between 10 and 12 plants m-2 B. ruziziensis, but with a large population of plants B. brizantha. The grain yield had linear reduction of 13.39 kg ha-1 per plant m-2 B. brizantha and average quadratic reduction of 42.04 kg ha-1 per plant m-2 of B. ruziziensis.Keywords: Zea mays, Urochloa, intercrop, cropping systems, no tillage.

scholarly journals Interactive Effects of Sowing Date and Planting Density on Dry Matter Accumulation and Partitioning of Chicory

2012 ◽  
Vol 40 (1) ◽  
pp. 183
Author(s):  
Hamid MADANI ◽  
Christos DORDAS ◽  
Ahad MADANI ◽  
Mohammad-Ali MOTASHAREI ◽  
Shima FARRI
Keyword(s):  
Root Biomass ◽  
Dry Matter ◽  
Plant Density ◽  
Total Yield ◽  
Growing Season ◽  
Sowing Date ◽  
Planting Density ◽  
Yield Potential ◽  
Total Biomass ◽  
Dry Matter Accumulation

Chicory is considered one of the alternatives crops that can be used in crop rotation and contains many phytochemicals that can be used in medicine. In addition, lengthening the growing season by early sowing may increase root chicory yield potential, and thus increase its competitiveness with traditional crops. The objectives of the present study were to determine whether early sowing date risks can be decreased by higher sowing density and also to study the effect of sowing date and sowing density on dry matter accumulation and partitioning of chicory. Growing season did not affect any of the characteristics that were studied. Also plant density affected the flowers biomass, root biomass per plant and the respective yield together with the plant height and essence yield and total yield. The sowing date affected the leaf, flower and stem biomass on a plant basis. However, the interaction between plant density and sowing date affected the total biomass per plant, the flower biomass per plant, the root biomass per plant, the flower yield, the root yield and the essence yield. These results indicate that for higher production it is important to determine the right plant density and sowing date which can affect growth, dry matter accumulation and essence yield.

EFFECT OF RATE AND TIME OF NITROGEN AND INTERVAL OF PHOSPHORUS AND POTASSIUM FERTILIZATION ON HERBAGE PRODUCTION ON PERMANENT PASTURE

1965 ◽  
Vol 45 (2) ◽  
pp. 153-164 ◽  
Author(s):  
L. B. MacLeod ◽  
L. P. Jackson ◽  
R. F. Bishop ◽  
C. R. MacEachern
Keyword(s):  
Soil Moisture ◽  
Dry Matter ◽  
Total Yield ◽  
Late Summer ◽  
Seasonal Distribution ◽  
Botanical Composition ◽  
Nitrogen Application ◽  
N Application ◽  
Permanent Pasture ◽  
Phosphorus And Potassium

In two 3-year cycles of a field experiment annual N treatments were superimposed on mineral treatments applied annually and triennially to a permanent pasture sward.Applications of P and K were reflected by changes in exchangeable K and acid-soluble plus adsorbed P. There was somewhat greater penetration of K than of P and soil levels of both were generally lowest where rate of N application was highest.Yields varied from year to year but tended to be more uniform with annual than with triennial mineral treatments. In the 6-year period average yields for all 0-, P-, K-, and P–K-treated plots were approximately 1.3, 1.6, 1.5, and 2.0 tons per acre of dry matter. Time of nitrogen application had little influence on total yield but seasonal distribution of herbage was much more uniform with nitrogen applied in summer than in spring. Soil moisture, which was a major factor in the response obtained with nitrogen applied in summer, was limiting during the late summer in two of the three years measured.Percentages of P and K in grass reflected the mineral treatments which had much less influence on botanical composition and species foliage cover than N. This element suppressed legumes, increased grass, and markedly influenced the K level in grass.

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