The influence of fertiliser nitrogen application on development and number of reproductive primordia in field-grown two- and six-rowed barleys

2004 ◽  
Vol 55 (3) ◽  
pp. 357 ◽  
Author(s):  
Sebastián Arisnabarreta ◽  
Daniel J. Miralles
Keyword(s):  
Unit Area ◽  
Nitrogen Supply ◽  
Heading Time ◽  
Grain Number ◽  
Nitrogen Rate ◽  
Barley Cultivars ◽  
Leaf Emergence ◽  
Number Of Leaves ◽  
Nitrogen Rates ◽  
Phenological Phases

A field experiment using different 2- and 6-rowed barley cultivars grown at two contrasting nitrogen supply rates (40 and 150 kg N/ha) without water restrictions was carried out to explore how the number of leaf primordia and the rate of leaf emergence interact to modify the duration of different pre-heading phenological phases, and to analyse the dynamics of initiation and mortality of different subcomponents of grain number per unit area, in response to different fertiliser nitrogen regimes.The lower nitrogen supply (40 kg N/ha) delayed heading time as a consequence of higher phyllochron, without any effect on the final number of leaves initiated in the apex. The different fertiliser nitrogen rates only altered the co-ordination between tiller appearance and leaf emergence in two of the 6-rowed cultivars, whereas for the rest of the cultivars, co-ordination between leaf emergence and primary tiller appearance was not altered by fertiliser nitrogen rate. The lower nitrogen supply resulted in less fertile florets per ear due to a reduction in floret primordia survival, without any effect on the maximum number of spikelet primordia initiated in the apex. The higher floret abortion observed in 6-rowed compared with 2-rowed cultivars could be associated with the fact that lateral floret primordia, in those apical and basal positions within the ear in 6-rowed cultivars, are poorly developed with respect to the central spikelets.

scholarly journals EFFECTS OF NITROGEN RATE ON GROWTH AND YIELD OF BAMBARA GROUNDNUT (Vigna subterranea (L.) Verdc.) IN JALINGO, TARABA STATE, NIGERIA

2020 ◽  
Vol 7 (12) ◽  
pp. 67-76
Author(s):  
M. M. Tyoakoso ◽  
M. D. Toungos ◽  
M. Babayola
Keyword(s):  
Grain Yield ◽  
Significant Influence ◽  
Bambara Groundnut ◽  
Growth And Yield ◽  
Row Spacing ◽  
Nitrogen Rate ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Nitrogen Rates ◽  
Number Of Branches

Field experiments was conducted during the 2015 rainy season at Teaching and Research Farm of Department of Crop Science, Taraba State College of Agriculture Jalingo, to investigate the effect of Nitrogen rates on the growth and yield of Bambara groundnut (Vigna subterranean (L.) Verdc) in Jalingo. The experiments was laid out in split-plot design with three replications and three nitrogen rates, 20kgNha-1, 25kgNha-1 and 30kgNha-1 as main plot treatment while four intra-row spacing, 20cm, 25cm, 30cm and 35cm as the sub plot treatment. The sub plot size was 3m x 2m (6m2). The nitrogen rate doses were applied a week after emergence of the seedlings. Data collected were, percentage seedlings emergence, number of leaves per plant, number of branches per plant, plant height, number of nodules per plant, number of effective nodules per plant, number of non-effective nodules per plant, days to 50% flowering, number of pods per plant, number of seeds per plant, 100 seeds weight, grain yield per plot and grain yield per ha-1. Data collected were subjected to Analysis of Variance (ANOVA), means were separated using Least Significant Difference (LSD). The results showed that nitrogen rate applied had no significant influence on growth and yield characters. However, significant influence was recorded of intra-row spacing on number of leaves per plant and number of branches per plant at 6WAS with a mean value of 48.24 and 16.80 respectively. Intra-row spacing, 25cm gave the highest mean number (3.14) of non-effective nodules per plant at 30 DAS while 25cm gave the highest number of days to 50% flowering. The result of the interaction revealed that there were significant interaction between Nitrogen rates and intra-row spacing on the number of leaves at 3 WAS and 6WAS. It is recommended that nitrogen rate of 20kgNha-1 and intra-row spacing of 35cm be adopted for Bambara groundnut in Jalingo.

scholarly journals Genotype × Environment × Management (G×E×M) Impacts on Grain Yield and Quality of Spring Malting Barley (Hordeum vulgare)

2021 ◽  
Vol 25 (02) ◽  
pp. 285-290
Author(s):  
Vladanka Stupar
Keyword(s):  
Grain Yield ◽  
Weather Conditions ◽  
Kernel Weight ◽  
Malting Barley ◽  
Seeding Rate ◽  
Nitrogen Rate ◽  
Barley Cultivars ◽  
Yield And Quality ◽  
Nitrogen Rates

Agronomic management and environment affect malting barley yield and quality. The objective of this study was to determine optimum agronomic practices (cultivar, fertilization, and seeding rate) for yield and quality of malting barley. A study was conducted during 2012–2014 in the region of Požarevac, southeastern Serbia, to evaluate the weather-dependent effect of seeding rate (S1=350, S2=450 and S3=550 seeds m–2) and nitrogen fertilization rate (N1=45, N2=75, N3=95 and N4=135 kg N ha–1) on the yield and quality of spring malting barley cultivars ('Novosadski 448', 'Novosadski 456', 'Dunavac' and 'Jadran'). Increasing seeding rate had a significantly negative effect on the quality, whereas the effect on yield was dependent upon weather during the growing season. Grain yield and grain protein content significantly increased with an increase in nitrogen rate up to 135 kg N ha–1. The optimum nitrogen rate for the average thousand-kernel weight and percentage of kernels ≥ 2.5 mm in all years was 75 kg N ha–1, and for test weight 105 kg N ha–1. Germinative energy depended on genotype and weather conditions, whereas seeding and nitrogen rates had a significant effect only during the first year. Results indicated that seeding rates above 350 seeds m–2 and nitrogen rates above 75 kg N ha–1 led to substantial grain quality deterioration in barley cultivars. © 2021 Friends Science Publishers

A comparison of leaf and ear development in barley cultivars as affected by nitrogen supply

1978 ◽  
Vol 90 (3) ◽  
pp. 503-508 ◽  
Author(s):  
J. E. Dale ◽  
R. G. Wilson
Keyword(s):  
Flag Leaf ◽  
Detailed Examination ◽  
High Concentration ◽  
Barley Cultivars ◽  
Leaf Emergence ◽  
Number Of Leaves ◽  
Nitrogen Treatment ◽  
Nitrogen Treatments ◽  
Opposing Effects ◽  
Low Nitrogen

SummaryTwenty-one two-row and 19 six-row barley cultivars, originating from the major barley growing areas, were compared in a duplicated experiment conducted under controlled environment conditions. Plants were grown in sand and supplied nitrate at two concentrations.Number of leaves on the mainstem and leaf emergence rate both varied widely but there were no consistent differences between two- and six-row cultivars. The low nitrogen treatment led to significant reductions in number of leaves and emergence rates. As a result of these opposing effects the time of appearance of the flag leaf was not affected by treatment. The number of leaves unfolded was a linear function of time where nitrogen was supplied at high concentration but for plants supplied with low nitrogen, appearance of the third and fourth leaves was considerably delayed. Cultivars producing fewer leaves on the mainstem also showed faster leaf emergence and both these factors contributed to the earliness of a cultivar.Low nitrogen treatments reduced number of spikelets per ear in both two-row and six-row barleys; this treatment also reduced the number of grain filled, although mean grain weight was not affected. Faster leaf emergence rates were associated with fewer spikelets per ear in both nitrogen treatments.Since they are based on a relatively large number of cultivars it is likely that these results are general for barley. The importance of further detailed examination of apical development is indicated.

scholarly journals Multiple Effects of Nitrogen Fertilization on Grape Vegetative Growth, Berry Quality and Pest Development in Mediterranean Vineyards

Horticulturae ◽  
2021 ◽  
Vol 7 (12) ◽  
pp. 530
Author(s):  
Arturo Cocco ◽  
Luca Mercenaro ◽  
Enrico Muscas ◽  
Alessandra Mura ◽  
Giovanni Nieddu ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Nitrogen Supply ◽  
Soluble Solids ◽  
Anthocyanin Content ◽  
Nitrogen Rate ◽  
Planococcus Ficus ◽  
Berry Quality ◽  
Nitrogen Rates ◽  
Positive Effect ◽  
Grape Yield

Nitrogen is a key macronutrient for the quantitative and qualitative yield of grapes; in addition, it influences the development and reproduction of grape pests. The multiple effects of different nitrogen rates were investigated on the red berry cultivar ‘Carignano’ and the grape pest Planococcus ficus in a two-year field trial. Different amounts of ammonium nitrate were compared: 0, 80 and 160 Units ha−1 for mineral nitrogen. The amount of nitrogen fertilization supplied influenced the nitrogen status of vines and increased the pruning weight and leaf area, as well as the overall grape yield, by increasing the cluster weight. However, doubling the nitrogen rate did not generally increase the vegetative and productive parameters of grapevines. At harvest, nitrogen supply did not influence the anthocyanin content, tritatable acidity, and soluble solids, although the latter parameter showed a clear, yet not significant, decreasing trend. Planococcus ficus exhibited higher fecundity, survival and shorter development time on grapevines provided with nitrogen, whereas its fertility was unaffected by nitrogen fertilization. Ultimately, nitrogen had a direct and positive effect on grape yield and vine mealybug development, highlighting the importance of integrated cultural and pest control practices to promote grape production.

Influence of Planting Stock Clove Size, Nitrogen Rate, and Planting Method on Elephant Garlic Production

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 517f-518
Author(s):  
Jeanine M. Davis
Keyword(s):  
Survival Rates ◽  
Ground Level ◽  
Winter Survival ◽  
Nitrogen Rate ◽  
Planting Stock ◽  
Mild Winter ◽  
Allium Ampeloprasum ◽  
Planting Methods ◽  
Planting Method ◽  
Nitrogen Rates

To produce large elephant garlic (Allium ampeloprasum L.) bulbs in the southeastern United States, stock cloves must be planted in the fall. During extremely cold winters, however, winter survival rates can be very low. A 2-year study was undertaken to examine practices to increase winter survival rates. Two clove sizes (≤20 g or >20 g), three nitrogen rates (112, 224, and 336 kg/ha), and three planting methods (flat, mulched, and hilled) were tested in a RCB design with four replications. For all planting methods, cloves were set in a shallow trench and covered with soil to ground level. This was also the flat treatment. For the mulched treatment, 7 cm of straw was spread on top. For the hilled treatment, soil was mounded 10 to 15 cm high over the ground level. Cloves were planted in early October and harvested in mid-June. Use of large planting stock cloves increased winter survival rates during the harsh winter, but had no effect during the mild winter. Both years, winter survival was reduced with the flat treatment. Yields of marketable bulbs were 4 to 5 times higher when >20 g cloves were planted than when ≤20 g cloves were used. Nitrogen rate and planting method had no effect on yields. The >20 g cloves also produced larger bulbs than the smaller cloves. Of the three planting methods, the flat treatment produced the smallest bulbs. Bulbs were much larger following the mild winter than the harsh winter.

Early spring and late autumn response to applied nitrogen in four grasses

1980 ◽  
Vol 94 (2) ◽  
pp. 443-453 ◽  
Author(s):  
D. Wilman ◽  
A. A. Mohamed
Keyword(s):  
Perennial Ryegrass ◽  
Leaf Blade ◽  
Unit Area ◽  
Total Yield ◽  
Early Spring ◽  
Late Winter ◽  
Number Of Leaves ◽  
Four Levels ◽  
Leaf Extension ◽  
Applied Nitrogen

SummaryThe regrowth of Aberystwyth S. 23 perennial ryegrass, S. 24 perennial ryegrass, S. 59 red fescue and S. 170 tall fescue was studied in field swards, comparing four levels of applied nitrogen, for 8 weeks following a clearing cut. The clearing cuts were in mid-October, mid-February and mid-March in each of 3 years, different plots being used on each occasion.The application of N increased the number of leaf primordia, the number of un-emerged leaves, the rate of leaf emergence and death, leaf blade length, width and weight, sheath length, number of leaves per unit area of ground and proportion of green tissue in total yield. The application of N had little effect on the number of leaves per tiller and tended to reduce weight per unit area of leaf blade. The increase in size, weight and number of leaf blades appeared to be major reasons for the positive effect of applied N on yield, previously reported; and the increase in sheath length contributed to the increase in proportion of yield above 4 cm. Rate of leaf extension was not closely related to yield and was more sensitive to temperature than was yield. Changes during regrowth in blade and sheath length helped to explain changes in weight per tiller, previously reported. The effects of improving weather conditions in late winter/early spring were similar to the effects of applied N: larger, heavier leaf blades, longer sheaths, a taller canopy, a lower proportion of dead material, younger leaves. The length of shoot apex per leaf primordium was relatively constant. Leaves continued to emerge, at a slow rate, in the period December–February. S. 170 had the biggest leaves, particularly in May, and the slowest rate of leaf turnover. Rate of leaf extension was increased by applied N more, on average, in the ryegrasses than in the fescues.

scholarly journals Effects of nitrogen on development and growth of the leaves of vegetables. 3. Appearance and expansion growth of leaves of spinach

1995 ◽  
Vol 43 (2) ◽  
pp. 247-260
Author(s):  
H. Biemond
Keyword(s):  
Leaf Area ◽  
Leaf Size ◽  
Field Trials ◽  
Leaf Expansion ◽  
Mature Leaf ◽  
Leaf Emergence ◽  
Number Of Leaves ◽  
Leaf Appearance ◽  
Rate Of Leaf Appearance ◽  
Main Factor

In a series of greenhouse and field trials, spinach cv. Trias plants were supplied with different amounts of N fertilizer in various split applications. Rates of leaf emergence and expansion were recorded, as well as final leaf size. The rate of leaf appearance varied between 0.16 and 0.57/day across experiments, but was hardly affected by N treatment. The rate of leaf expansion and mature leaf area increased with leaf number, reaching maximum values at leaf pair 3+4 or 5+6 and decreasing subsequently. Both characteristics were positively correlated with N supply. The duration of expansion was not influenced by N treatments and varied between 15 and 30 days in most experiments. The rate of leaf expansion was the main factor determining mature leaf size. Specific leaf area over all green leaves slowly decreased with time in most experiments and was around 300 cmsuperscript 2/g. As the differences in the number of leaves were small, the differences in total green leaf area per plant resulted from differences in the areas of individual mature leaves.

scholarly journals Effects of Three Levels of N, P, K on the Growth of Sander's Dracaena (D. sanderiana Hort.).

1969 ◽  
Vol 63 (2) ◽  
pp. 229-235
Author(s):  
Saulo J. Rodríguez ◽  
Carlos Rivera-López
Keyword(s):  
Root Growth ◽  
Unit Area ◽  
Factorial Experiment ◽  
Peat Moss ◽  
Fresh Weight ◽  
Growing Period ◽  
Mean Size ◽  
Total Growth ◽  
Number Of Leaves ◽  
Dracaena Sanderiana

Sander's Dracaena (Dracaena sanderiana, Hort.) was grown in 3 x 3 x 3 N, P, K factorial experiment in a 1:1 mixture of peat moss and Cataño sand. Commercial cuttings were harvested at regular intervals during a 32-mo growing period. Fresh weight, length, number of leaves , and weight of leaves was recorded from each harvested cutting. Nitrogen affected significantly the number of harvested cuttings per unit area, total growth and total top growth, all of which were highest at 600 pounds of N/acre/yr. Phosphorus affected significantly only the number of harvested cuttings while potassium affected significantly total growth, top growth, root growth, mean size and mean weight of harvested cuttings, and leal mean weight. The fitting of a modification of the fertilizer-yield equation Y = A/1 + B( C - X)2 showed that maximum yields in terms of number of cuttings were obtained with a combination of approximately 648, 465 and 583 pounds of N, P, K/acre/yr, respectively. The maximum total growth and top growth depended more on the phosphorus and less on the potassium. Root growth was definitely affected by the phosphorus applications.

scholarly journals Effects of nitrogen on yield and chlorophyll of potato (Solanum tuberosum L.) cultivars

1970 ◽  
Vol 38 (2) ◽  
pp. 163-169 ◽  
Author(s):  
Semiha Güler
Keyword(s):  
Solanum Tuberosum ◽  
Tuber Yield ◽  
Solanum Tuberosum L ◽  
Total Yield ◽  
Correlation Coefficients ◽  
Tuber Number ◽  
Tuber Weight ◽  
Nitrogen Rate ◽  
Leaf Chlorophyll ◽  
Nitrogen Rates

Effects of nitrogen on the leaf chlorophyll (chl), yield and yield attributing characters of potato as tuber number and mean tuber weight were studied. Correlation coefficients between the investigated characters were determined. Five nitrogen rates (0, 150, 200, 250 and 300 kg/ha) and four potato cultivars (Burren, Slaney, Anna and Emma) were used in the study. First, second, third class tuber yields and total tuber yield, tuber number per plant, and leaf chl were significantly influenced by both nitrogen rate and cultivar, whereas mean tuber weight was affected only by cultivar. Maximum total yield was obtained at 200 kg N/ha. There was significant linear relationship between leaf chl and N applied (R2=0.91). There were significant correlations between chl and yield and yield related characters. Total yield significantly correlated with leaf chl. Correlations between first class yield and total yield as well as total yield and tuber number per plant were highly significant.   Key words: Potato; Solanum tuberosum L.; Leaf chlorophyll; Nitrogen; Yield DOI: 10.3329/bjb.v38i2.5141 Bangladesh J. Bot. 38(2): 163-169, 2009 (December)  

Plant population and shading studies in barley

1971 ◽  
Vol 77 (3) ◽  
pp. 445-452 ◽  
Author(s):  
R. W. Willey ◽  
R. Holliday
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Unit Area ◽  
Grain Filling ◽  
Crop Growth ◽  
Plant Population ◽  
Grain Number ◽  
Ear Development ◽  
Development Period ◽  
Lower Production

SUMMARYTwo barley experiments are described in which a range of plant populations were shaded during different periods of development. Shading during the ear development period caused considerable reductions in grain yield, largely by reducing the number of grains per ear. Shading during the grain-filling period caused no reduction in grain yield. It is suggested that under conditions of these experiments there was probably a potential surplus of carbohydrate available for grain filling and that grain yield was largely determined by the storage capacity of the ears. The importance of the number of grains per ear as an indicator of individual ear capacity is emphasized.The effects of plant population on grain yield and its components are also examined. It is concluded that the number of grains per ear is the component having greatest influence on the decrease in grain yield at above-optimum populations and attention is again drawn to the possible importance of ear capacity. It is argued that on an area basis the number of grains per unit area may give a good indication of ear capacity. Examination of this parameter shows a close relationship with grain yield per unit area for both the shading and population treatments. It is particularly evident that a decrease in grain yield at high populations was associated with a comparable decrease in the number of grains per unit area. It is suggested that this decrease in grain number may be due to a lower production of total dry matter during ear development rather than an unfavourable partitioning of this dry matter between the ear and the rest of the plant. This lower production of total dry matter is attributed to the crop growth rates of the higher populations having reached their peak and then having declined before the end of the ear development period. This crop growth rate pattern, through its effect on grain number per unit area, is put forward as the basic reason why, in the final crop, grain yield per unit area decreases at above-optimum populations.

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