INFLUENCE OF PLANT DENSITY ON PRODUCTIVINESS AND CORRELATION BETWEEN PRODUCTIVITY ELEMENTS

2020 ◽  
Vol 03 (04) ◽  
pp. 14-25
Author(s):  
Mahira Aydin Veliyeva ◽  
Keyword(s):  
Density Dependence ◽  
Cotton Plant ◽  
Plant Density ◽  
Experimental Plot ◽  
Irrigation Regime ◽  
Vegetative Organs ◽  
Factors Affecting ◽  
Irrigation Regimes ◽  
Plant Densities ◽  
External Conditions

The article is devoted to the introduction of the “Studying of the effect of external conditions and components of agro-technical cultivation components on falling degree of vegetative organs of cotton plant” which was started in 2011, where the plant density is also described. The experiment was carried out in the plots with 100m length, 4- rowed fields by 4 repeats and 12 options. The size of each of the rows was 240 m2, total experimental plot equaled 240 x 12 x 4=11520m2. By that purpose observation over plant densities had been conducted in the experiments which were based on introduction of microelements at two periods, on background of fertilizers N100 P100 K50, two plant densities and three deeply varying irrigation regimes. The factors affecting on decline at 6020x1; 60x20x2 plant density, dependence between plant density and mass of a ball, plant density and productiveness are determined. Key words:plant density, water-nutrition, irrigation regime, hard, optimal, high regime of irrigation, nutrition area, fruit organs, falling, correlation.

Influence of cultivation factors on productivity of cotton variety “Ganja-114”

2021 ◽  
Vol 03 (01) ◽  
pp. 18-21
Author(s):  
Dilarə Səfər qızı Marlamova ◽  
◽  
Savalan Nərman oğlu Əliyev ◽  
İsmayıl Rza oğlu Nəbiyev ◽  
Ədalət Əhliyyət oğlu İmanov ◽  
...  
Keyword(s):  
Active Substance ◽  
Plant Density ◽  
Negative Impact ◽  
Research Work ◽  
Irrigation Regime ◽  
Cotton Variety ◽  
Irrigation Regimes ◽  
Key Factor ◽  
Long Time ◽  
Plant Densities

Cotton is very valuable technical crop. This crop keeps its strategical significance still its cultivation. Increasing productivity and improving its quality is a key factor for new certificated cotton varieties to remain in production for a long time. For this, it is important for each of the variety to have its own (according to its biological characteristics) fertilizer rate, plant density and irrigation regimes. That is, the incorrect application of these parameters has a negative impact on productivity. As a result, a variety that has been painstakingly created for many years may soon become extinct. For this purpose, in order to study the optimal agrotechnics of the newly certificated cotton variety “Ganja-114” the research work was carried out in Ganja-Kazakh region, at 2 plant densities 60x15-1 and 60x20-1, with 2 ferilizer norms N90P100, N120P100 kg of active substance and 2 irrigation regimes 65-65-65%; 70-70-65%. According to the results of the research work on average 34,5 cent. Of product was obtained from the mentioned variety, in 2018-2019 when N90P100 kg of active substance, 65-65-65% irrigation regime was applied at 60x15-1 plant densities. Key words: cotton plant, variety, plant density, irrigation regime, optimal ag rotechnics, productiveness

scholarly journals Integrated Effect of Plant Density, N Rates and Irrigation Regimes on the Biomass Production, N Content, PAR Use Efficiencies and Water Productivity of Rice Under Irrigated Semiarid Environment

2012 ◽  
Vol 40 (1) ◽  
pp. 201 ◽  
Author(s):  
Shakeel AHMAD ◽  
Mirza HASANUZZAMAN
Keyword(s):  
Grain Yield ◽  
Management Practices ◽  
Field Experiments ◽  
Plant Density ◽  
Block Design ◽  
Water Productivity ◽  
Research Area ◽  
Semiarid Environment ◽  
Irrigation Regimes ◽  
Plant Densities

Two field experiments were conducted for two years (2000 and 2001) at Agronomic Research Area, University of Agriculture Faisalabad (UAF), Pakistan. There were 15 treatment combinations for experiment-I having three plant densities, viz., one seedling hill-1 (PD1), two seedlings hill-1 (PD2) and three seedlings hill-1 (PD3) and five nitrogen rates, viz., 0, (N0); 50, (N50); 100, (N100); 150, (N150); and 200 (N200) kg N ha-1. Experiment-II also included 15 treatments having three plant densities, viz., one seedling hill-1 (PD1), two seedlings hill-1 (PD2) and three seedlings hill-1 (PD3) and five irrigation regimes, viz., 62.5 cm (I1), 77.5 cm (I2), 92.5 cm (I3), 107.5 cm (I4), and 122.5 cm (I5). A randomized complete block design (RCBD) was employed with three repetitions. The results for experiment-I revealed that the highest biomass (1438 g m-2), grain yield (497 g m-2), crop growth rate (15.36 g m-2 d-1), net assimilation rate (4.24 g m-2 d-1) were observed in the treatment having combination of two seedlings hill-1 and 200 kg N ha-1 (PD2N200). The agronomic and economic nitrogen and PAR use efficiencies were also higher in this treatment. In case of experiment-II, the highest biomass and grain yield were obtained in case of treatment having combination of two seedlings hill-1 and 107.5 cm irrigation regime (PD2I107.5). The irrigation application based water productivity ranged from 0.36 kg mm-3 to 0.61 kg mm-1, irrigation plus precipitation based water productivity ranged from 0.32 kg mm-3 to 0.55 kg mm-3 and evapotranspiration based water productivity ranged from 0.65 kg mm-3 to 0.84 kg mm-3 among 15 treatments combination of plant density and irrigation regimes. This study concludes that for increasing the benefits for the resource-poor growers, the integration of crop management practices is an optimum strategy to substantially increase the resources use efficiency under irrigated semiarid environment.

scholarly journals Plant density and peanut crop yield (Arachis hypogaea) in the peanut growing region of Córdoba (Argentina)

2018 ◽  
Vol 45 (2) ◽  
pp. 82-86 ◽  
Author(s):  
F.D. Morla ◽  
O. Giayetto ◽  
E. M. Fernandez ◽  
G. A. Cerioni ◽  
C. Cerliani
Keyword(s):  
Field Experiments ◽  
Plant Density ◽  
Yield Response ◽  
Factors Affecting ◽  
Growing Seasons ◽  
Peanut Crop ◽  
Wide Range ◽  
Plant Densities ◽  
Growing Conditions ◽  
Growing Region

ABSTRACT Plant density is one of the most important management factors affecting the peanut growth, modifying the capacity to capture radiation, water and nutrients. Peanut yield response to increased plant density changes according to environmental conditions, the genotype used, and planting date. Therefore, the optimum plant density (OPD) may vary with location. The aim of this project was (i) to fit the Mitscherlich's equation of diminishing productivities to the yield response of runner-type peanuts to increasing plant density under different growing conditions in the peanut growing region of Cordoba Argentina; and (ii) validate this model with independent experimental data. The first stage was based on the analysis of data from different projects of plant densities carried out in the peanut growing area of Córdoba. This information was adjusted to the decreasing yield equation and the OPD was calculated. For validation, a field experiment was conducted during the 2013/14 and 2014/15 growing seasons under irrigated and rain-fed conditions where pod yield was evaluated for 5, 12, 18, 25 and 36 plants/m2. No interaction was detected between soil moisture conditions and plant density. Yield response to plant density had a high degree of fitness for a wide range of environmental and crop conditions. In field experiments, the peanut yield decreased only at the lowest plant density (5 plants/m2). Yield response to density adjusted to the Mitscherlich equation indicated that OPD ranged from 10.5 to 24.8 plants/m2. Using a single adjustment equation y = 1(1 – e−0.1784x), OPD was estimated to be 16.8 plants/m2 at harvest (11.7 plants per linear meter in 0.7 m between rows) for the peanut growing region of Cordoba. This approach can be a valuable input, along with other variables to analyze, when choosing peanut sowing density.

A study of the principal factors affecting the establishment and development of the field bean (Vicia faba)

1952 ◽  
Vol 42 (4) ◽  
pp. 335-346 ◽  
Author(s):  
M. H. R. Soper
Keyword(s):  
Plant Density ◽  
Low Fertility ◽  
Field Bean ◽  
Individual Plant ◽  
High Fertility ◽  
Factors Affecting ◽  
Wide Range ◽  
Plant Densities ◽  
Dry Seasons ◽  
The Individual

1. A survey of bean crops was carried out in the Oxford area in the years 1947–9 with the object of studying farmers' methods, and the factors affecting establishment and development of the crop in the field.2. The season and the fertility status of the soil have a profound influence on the development of the crop, while plant density affects the growth of the individual plant.3. Hard winters cause crop losses which may amount to more than 50% of the plants. Mortality continues throughout the season.4. A warm dry spring and an equable summer temperature favour pod production more than hot, dry seasons.5. High plant densities cause: (1) a reduced rate of pod formation on each plant over a wide range of conditions, but a greater reduction on poor land than under good conditions; (2) a reduction in stem formation on low fertility fields (but not on high fertility land); (3) a significant increase in pod production per acre on high quality fields.6. A high level of fertility leads to significantly more pods/acre, owing to better plant survival and increased branching and podding.7. Under conditions favouring vegetative growth, there appears to be some competition between stem production and pod production, for the correlation between stems/plant and pods/plant found on low fertility land and in dry seasons no longer holds under good growing conditions.8. In an average crop, there is a very serious loss of flowers and partly matured pods, which may amount to 85% of the flowers formed.9. This wastage may be due to (1) unsatisfactory pollination or self-infertility, (2) inadequate availability of certain plant nutrients, (3) unsuitable environmental conditions, particularly low light intensity in dense crops.10. Botrytis cinerea can cause a high wastage of crop, but it did not figure prominently during the 3 years of the survey, and appeared to be associated with deficiency of potash and/or phosphate in the only two severe outbreaks that occurred.

INFLUENCE OF PLANT DENSITY ON THE DISTRIBUTION OF 14C-LABELLED ASSIMILATE IN MAIZE AT FLOWERING

1979 ◽  
Vol 59 (3) ◽  
pp. 577-584 ◽  
Author(s):  
G. O. EDMEADES ◽  
N. A. FAIREY ◽  
T. B. DAYNARD
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Plant Density ◽  
Reproductive Organs ◽  
Planting Density ◽  
Dominant Factor ◽  
Vegetative Organs ◽  
Coefficients Of Variation ◽  
Plant Densities ◽  
Lower Stem

The distribution pattern of 14C-labelled assimilate in the flowering shoot of maize (Zea mays L.) grown in the field at three plant densities (50 000, 100 000 and 150 000 plants/ha) was determined by labelling with 14CO2 at 1 day after anthesis. Shoots were harvested 4 days later. Four leaf positions were fed 14CO2 at each density; relative to the ear leaf (EL), these were EL+4 (i.e. fourth leaf above ear leaf), EL+2, EL, and EL-2. At the lowest plant density EL-4 was also labelled. The dominant factor influencing assimilate distribution was the position of the assimilating leaf rather than plant density. Assimilate from upper leaves supplied the tassel, upper stem, and ear preferentially. Assimilate from lower leaves supplied the lower stem and ear. Among leaf positions the ear leaf supplied the greatest percentage of its assimilate (26% at 50 000 plants/ha and 19% at 150 000 plants/ha) to the developing cob (rachis plus grain initials). As density increased so did the proportion of labelled assimilate remaining in labelled leaves. Coefficients of variation, computed among individual plants, indicated that assimilate distribution to reproductive organs was more variable than that to vegetative organs and that this variability increased with planting density.

scholarly journals Leaf miner incidence in coffee plants under different drip irrigation regimes and planting densities

2012 ◽  
Vol 47 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Gleice Aparecida Assis ◽  
Franscinely Aparecida Assis ◽  
Myriane Stella Scalco ◽  
Francisco José Toloza Parolin ◽  
Iraci Fidelis ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Plant Density ◽  
Block Design ◽  
Leaf Miner ◽  
Monthly Basis ◽  
Drought Period ◽  
Irrigation Regimes ◽  
Randomized Block Design ◽  
Plant Densities ◽  
Coffee Plants

The objective of this work was to evaluate the effect of different drip irrigation regimes and planting densities on the incidence of the leaf miner, Leucoptera coffeella, in arabica coffee plants for one year. The experiment was carried out in 2008, in a complete randomized block design, in a split-plot in time arrangement, with four replicates. The treatments consisted of four drip irrigation regimes - soil water balance, irrigations at 20 and 60 kPa soil tensions, and a nonirrigated treatment -, which were distributed at three plant densities: 2, 500, 5, 000, and 10, 000 plants per hectare. The evaluations were made on a monthly basis between January and December 2008. The highest pest occurrence period was from August to November, a season with low-air relative humidity preceded by a drought period. Irrigated coffee plants showed an incidence of intact mines 2.2 times lower than that of nonirrigated plants. Irrigation and increasing of plant density contribute to the reduction of coffee leaf miner occurrence.

PHYTO-CLIMATIC OBSERVATIONS ENSURING THE INCREASE OF THE COTTON YIELD

2020 ◽  
Vol 57 (08) ◽  
pp. 33-45
Author(s):  
Mahira Aydin Veliyeva ◽  
Keyword(s):  
Soil Temperature ◽  
Growth And Development ◽  
Plant Density ◽  
Research Work ◽  
Soil Surface ◽  
Vegetation Period ◽  
Cotton Field ◽  
Factors Affecting ◽  
Excessive Heat ◽  
Irrigation Regimes

The factors affecting on the decrease of cotton productivity are discussed in the article. With this purpose, the foundation for the research work on the study “Influence of external factors and components of agro-technical cultivation on the degree of falling fruit organs of cotton” was laid in 2011. The research work had been carried out in four-rowed plots with 100 m of length, 12 variants with four-fold repetition. The total area of experimental plot formed 11520 m2. The results of observations and calculations based on studies conducted under three sharply differing irrigation regimes, two plant densities and the use of micro-elements in two periods are analyzed. There are a lot of difficulties in growing a systematically stable crop from cotton fields. One of them is falling of fruit organs. Falling of fruit organs of cotton plant (bud, flower, ovary) due to physiological decline and violation of agro-technical measures forms 50-60% and sometimes more. Falling of fruit organs also depends on hereditary factors. Lack or abundance of moisture content of the soil, unbalanced fertilizers, strong winds, excessive heat, damage by diseases and pests, etc. Reinforce the falling process, which leads to lower yields. An urgent task is to study ways for regulating the global problem - to reduce the fall of the fruit organs in order to increase productivity. The influence of phytoclimate, plant density and microclimate was studied under three different irrigation regimes. Systematic observations over the soil temperature had been conducted from the beginning to the end of the vegetation period. As a result of the study, it was found that the soil under the vegetative layer warms up later. There is a continuous heat exchange between the soil surface and the lower layers. The study of the relationship between the temperature conditions and the growth and development of plants is of great significance in the practice of agricultural crops. For this purpose, the effect of changes in soil temperature on cotton field under the influence of irrigation regimes on productivity, growth and development of plants is determined. The influence of irrigation - the most important element of the complex of agro-technical methods - on change of soil temperature, duration of the each irrigation, soil cooling depth, productiveness, growth and development of plants is studied in the article. Key words: fruit organs, fall, irrigation regime, hard, optimal, high, soil temperature, maximum and minimum temperatures

scholarly journals A comparative study on the reproductive success of two rewarding Habenaria species (Orchidaceae) occurring in roadside verge habitats

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Wenliu Zhang ◽  
Jiangyun Gao
Keyword(s):  
Reproductive Success ◽  
Fruit Set ◽  
Plant Density ◽  
Flowering Plant ◽  
Floral Display ◽  
Pollinator Behaviour ◽  
Factors Affecting ◽  
Nectar Sugar ◽  
Viable Seeds ◽  
Viable Embryo

Abstract Background Most orchid species have been shown to be severely pollination limited, and the factors affecting reproductive success have been widely studied. However, the factors determining the reproductive success vary from species to species. Habenaria species typically produce nectar but exhibit variable fruit set and reproductive success among species. Here, we investigated the influence of the flowering plant density, inflorescence size, breeding system, and pollinator behaviour on the reproductive success of two rewarding Habenaria species. Results Our observations indicated that Habenaria limprichtii and H. petelotii co-occur in roadside verge habitats and present overlapping flowering periods. Both species were pollination limited, although H. limprichtii produced more fruits than H. petelotii under natural conditions during the 3-year investigation. H. petelotii individuals formed distinct patches along roadsides, while nearly all H. limprichtii individuals clustered together. The bigger floral display and higher nectar sugar concentration in H. limprichtii resulted in increased attraction and visits from pollinators. Three species of effective moths pollinated for H. limprichtii, while Thinopteryx delectans (Geometridae) was the exclusive pollinator of H. petelotii. The percentage of viable seeds was significantly lower for hand geitonogamy than for hand cross-pollination in both species. However, H. limprichtii may often be geitonogamously pollinated based on the behaviours of the pollinators and viable embryo assessment. Conclusions In anthropogenic interference habitats, the behaviours and abundance of pollinators influence the fruit set of the two studied species. The different pollinator assemblages in H. limprichtii can alleviate pollinator specificity and ensure reproductive success, whereas the more viable embryos of natural fruit seeds in H. petelotii suggested reducing geitonogamy by pollinators in the field. Our results indicate that a quantity-quality trade-off must occur between species with different breeding strategies so that they can fully exploit the existing given resources.

Assessment of sowing dates and plant densities using CSM-CROPGRO-Soybean for soybean maturity groups in low latitude

2021 ◽  
pp. 1-14
Author(s):  
L. S. Sampaio ◽  
R. Battisti ◽  
M. A. Lana ◽  
K. J. Boote
Keyword(s):  
Management Practices ◽  
Field Experiments ◽  
Plant Density ◽  
Crop Model ◽  
Management Scenarios ◽  
Low Latitude ◽  
Area Index ◽  
Sowing Dates ◽  
Plant Densities ◽  
Maturity Groups

Abstract Crop models can be used to explain yield variations associated with management practices, environment and genotype. This study aimed to assess the effect of plant densities using CSM-CROPGRO-Soybean for low latitudes. The crop model was calibrated and evaluated using data from field experiments, including plant densities (10, 20, 30 and 40 plants per m2), maturity groups (MG 7.7 and 8.8) and sowing dates (calibration: 06 Jan., 19 Jan., 16 Feb. 2018; and evaluation: 19 Jan. 2019). The model simulated phenology with a bias lower than 2 days for calibration and 7 days for evaluation. Relative root mean square error for the maximum leaf area index varied from 12.2 to 31.3%; while that for grain yield varied between 3 and 32%. The calibrated model was used to simulate different management scenarios across six sites located in the low latitude, considering 33 growing seasons. Simulations showed a higher yield for 40 pl per m2, as expected, but with greater yield gain increments occurring at low plant density going from 10 to 20 pl per m2. In Santarém, Brazil, MG 8.8 sown on 21 Feb. had a median yield of 2658, 3197, 3442 and 3583 kg/ha, respectively, for 10, 20, 30 and 40 pl per m2, resulting in a relative increase of 20, 8 and 4% for each additional 10 pl per m2. Overall, the crop model had adequate performance, indicating a minimum recommended plant density of 20 pl per m2, while sowing dates and maturity groups showed different yield level and pattern across sites in function of the local climate.

Unfilled Training Positions in Germany – Regional and Establishment-Specific Determinants

2019 ◽  
Vol 239 (4) ◽  
pp. 661-701 ◽  
Author(s):  
Sandra Dummert ◽  
Ute Leber ◽  
Barbara Schwengler
Keyword(s):  
Related Factors ◽  
Factors Affecting ◽  
External Conditions ◽  
Western Germany ◽  
Enterprise Level ◽  
Specific Factors ◽  
Regional Factors ◽  
The One ◽  
Training Position ◽  
Quantitative Importance

AbstractThe current situation in the German apprenticeship market is characterized by two contradictory developments. On the one hand, establishments are experiencing increasing problems filling the training positions they offer, and the number of vacant training positions is climbing. On the other hand, the transition into training is still difficult for many young people, and the number of unsuccessful vocational training applicants is rising. Hence, matching supply with demand is becoming increasingly difficult in the German job market for training positions. Using the Linked Employer-Employee dataset (LIAB) from the Institute for Employment Research (IAB), our paper provides a closer examination of the phenomenon of unfilled training positions. It presents an overview of the evolution of vacant training positions in eastern and western Germany and attempts to explain the number of vacancies by investigating the factors responsible for the establishments’ inability to fill their training positions. We assume that training position vacancies are due not only to internal company reasons such as firm size or the wage offer for apprentices but also to external conditions such as general regional factors. Therefore, our analysis also considers the situation on the demand side of the labor market within a region. The results of our multilevel mixed-effects estimations show that in addition to characteristics on the enterprise level, regional determinants also affect the share of vacant apprenticeships. With respect to establishment-related factors, mainly characteristics that describe the attractiveness of the firm prove to be important. With regard to regional-specific factors, we find that the availability of school leavers in a region in addition to the level of regional-sectoral competition impacts the recruiting success of establishments. Our analysis also shows that there are remarkable differences between eastern and western Germany concerning both the quantitative importance of unfilled training positions and the factors affecting them.

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