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جستجوی مقالات مرتبط با کلیدواژه "plant density" در نشریات گروه "محیط زیست"

تکرار جستجوی کلیدواژه «plant density» در نشریات گروه «علوم پایه»
جستجوی plant density در مقالات مجلات علمی
  • Hassan Dehghanian, Safar Nasrollahzadeh *
    Objective
    Field experiment was conducted in 2009 to investigate the effects of plant density and weed interference on morphological characteristics and yield of corn (Zea Mays, L.) at Research Station of University of Tabriz, Tabriz, Iran.
    Methods
    The experiment was arranged as split plot based on randomized complete block design with three replications. Plant density (D1, D2, D3 and D4: 5, 7, 10 and 16 plant m-2, respectively) were assigned to main plots and three levels of weed interference ((W1, W2 and W3:  weed free, between row weed interference and full-season weed interference) were allocated to the sub plots.
    Results
    The Results showed that with increasing plant density, grain and biological yield increased, but cob weight, ear length, ear diameter and harvest index decreased. The highest amount of morphological traits and harvest index was obtained from 5 plant m-2.The weed interference treatments had significant effects on above traits so the highest morphological traits, grain yield, biological yield and harvest index was obtained from weed free treatment. These results indicated that high plant densities because of decreasing weed interference and increasing grain and biological yield, is the effective agronomic solution for increasing corn performance in the field and can be used to reduce consumption of chemical pesticides in sustainable agriculture systems.
    Keywords: corn, Plant density, interference, Weed, Yield
  • The Investigation of Oil Yield of Three Varieties of Black Seed (Nigella Sativa) in Different Plant Densities
    Esmaeil Gholinezhad *, Behnaz Abdolrahimi
    In In order to investigating changes range of oil yield and percentage attention to plant density on three varieties of black seed, an experiment was conducted in the form of factorial based on completely randomized block designs (RCBD) with 4 replications in Saat-Loui agricultural station of West Azerbaijan province. In this research, the first factor (A) contained two levels 20 and 40 cm inter rows, the second factor (B) contained three levels 2, 4 and 6 cm intra rows and the third factor (C) contained three different varieties of Baft, Bukan, and Arbil. The specimens were planted on April 22nd, 2009. The results showed that the effects of plant density and harvest arrangement on grain yield, oil yield and oil percentage were significant. The highest and least grain yield, oil yield and oil percentage obtained from varieties of Baft and Arbil respectively. Oil percentage of inter rows 20 cm and intra rows 6 cm was 31.26 and 33.77 percent respectively. The content of oil percentage in variety Baft was 32.33 percent. Overall, the best content of oil percentage obtained from inters rows 20 cm with intra rows 6 cm in variety Baft about 37.47 percent.
    Keywords: Intra row, Inter row, Nigella sativa, oil yield, Plant density
  • Mohammad Javad Shakouri *, Mohammad Hossien Bijeh Keshavarzi, Akram Feiz Abadi, Mahbob Lotfi
    Pepper is one of the nutrition demanding vegetable. In order to compare N fertilizer uptake and plant numbers per area unit, an experiment was conducted with replications. In which fertilizer was the main factor and included Ammonium nitrate in 7 levels (0, 80, 160, 240 kg /ha-1) and 40+40, 80+80, 120+120 kg/ha-1 (in 2 stages i.e. Half of these amounts appliedpre planting and the other half of itside dressed in flowering stage).The second factor (plant density) comprised of 3 levels (25000, 35000 and 50000). The data such as: fruit numbers per plot and per plant, plant’s height yield per plant, fruit weight and prematurity percentage were detemined. According to the results simple and interaction effects of factors on yield and fruit numbers were significant, but N fertilizer had no significant effect on plant’s height. Data means comparison showed that green pepper’s yield was 100% higher than the control when using 240 kg N ha-1. Resultsalso showed that by increasing the plant numbers per area unit, the yield of each plant and fruit numbers in each plant were decreased.
    Keywords: Capsicum annuum, Yield, Nitrogen (N), Plant density
  • Narges Zand *, MohammadReza Shakiba

    A field experiment was conducted in 2010, to evaluate the effects of plant density (D1, D2 and D3: 8, 14 and 20 plant/m2) on field performance of Sorghum under different nitrogen application rates (N1, N2 and N3: application of 40, 80 and 120 kg/ha Nitrogen, respectively). The experiment was arranged as factorial based on randomized complete block design in three replicates. Results indicated that as plant density increased tillers per plant, Steam diameter and days to 50% flowering decreased, the effects of N application rate on these traits were not significant. While tillers per unit of area increased as more plant density. Plant height not affected by both treatments. As plant density and N application rates raised grain yield increased. Thus, N application and plant density increases can raise yield of grain sorghum

    Keywords: Plant density, Nitrogen, Grain yield, Sorghum
  • Leila Gharib Ardakani *, Hooshang Farajee, Abdolsamad Kelidari
    In order to investigate drought stress and plant density the yield, yield components and protein of spotted bean grain (cultivar Talash), an experiment was carried out as split plots in randomized complete blocks with three replications in Yasouj, in 2012. Factors of the test including irrigation in three levels; without stress (control treatment), water stress in vegetative stage (interrupting the irrigation at the opening stage of the third to fourth true leaf), and water stress at reproductive stage (interrupting the irrigation at the stage of 50% flowering) as the main factors and four density level including 15, 25, 35 and 45 plants per m2 were considered as sub-factors. The results showed that, the effect of water stress, plant density and interaction of water stress and plant density on grain yield, grains number in the pod, pods number in the plant and the weight of 100 grains was significant. The maximum yield was observed in the control plot and density of 45 plants per m2, also the minimum yield was observed in the reproductive stress treatment and density of 25 plants per m2 by 2398 and 1629 kg/ha respectively. Water stress treatment caused yield reduction at the stage of vegetative and reproductive growth by 10.4% and 32% respectively. The maximum amount of protein was obtained in the water stress treatment at the stage of reproductive growth. Considering the results of this experiment, the densities of 45 plants per m2 for normal irrigation conditions as well as 35 plants per m2 under water stress conditions are suggested
    Keywords: Spotted bean, Plant density, Water stress, Protein, Grain yield
نکته
  • نتایج بر اساس تاریخ انتشار مرتب شده‌اند.
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