Szerző szerinti böngészés "Helyes, Lajos"

Megjelenítve 1 - 15 (Összesen 15)
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    TételSzabadon hozzáférhető
    Application of mycorrhizae and rhizobacteria inoculations in the cultivation of processing tomato under water shortage
    (2023-12-01) Nemeskéri, Eszter; Le, Anh Tuan; Bakr, Jawdat; Posta, Katalin; Neményi, András B.; Pék, Zoltán; Takács, Sándor; Helyes, Lajos
    The effect of mycorrhizal fungi and plant growth promoting rhizobacteria on some physiological properties, yield and soluble solid content (Brix) of ‘Uno Rosso’ F 1 processing tomato was studied under water scarcity. Inoculation was performed with mycorrhizal fungi (M) and rhizobacteria preparation (PH) at sowing (M1, PH1) and sowing + planting (M2, PH2). The treated and untreated plants were grown with regular irrigation (RI = ET100%), with deficit irrigation (DI = ET50%) and without irrigation (I0). In drought, the canopy temperature of plants inoculated with arbuscular mycorrhizal fungi (M1, M2) decreased significantly, however, the decrease was small in those treated with the bacterium (PH1, PH2), while the SPAD value of the leaves of plants treated only with Phylazonit increased significantly. On two occasions, inoculations (M2, PH2) significantly increased the total yield and marketable yield, however, under water deficiency, a higher rate of green yield was detected than untreated plants. In dry year using deficit irrigation, the one-time inoculation (M1, PH1) provided a more favorable Brix value, while the double treatments reduced the Brix. In moderate water scarcity, the use of mycorrhizal inoculation (M2) is preferable, while under weak water stress, the use of rhizobacteria inoculation (PH2) is more favorable.
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    TételKorlátozottan hozzáférhető
    Effect of Abiotic and Biotic Factors on the Lycopene Content of Tomato.
    Helyes, Lajos; Pék, Zoltán; Neményi, András; egyetemi oktató, kutató
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    TételSzabadon hozzáférhető
    Effect of different production types on the yield and ß-carotene content of sweet potato /cultivar Ásotthalmi- 12/
    (2021-06-01) Balázs, Viktor; Helyes, Lajos; Pék, Zoltán; Neményi, András; Takács, Sándor; Égei, Márton; Daood, Hussein G.
    Production of sweet potato is extending in Hungary, despite the fact that there is no field-specific production technology. Therefore, many growers cannot utilize potential yields and quality. The goal of this study was to determine the optimal production method of the Ásotthalmi 12, a Hungarian sweet potato cultivar which can adapt to the Hungarian climate. The effect of single and twin rows production on the yield of this cultivar was examined. The planting was carried out on June 24 th , the harvesting on October 20 th and the growing-season was 120 days long. Uniform nutrient supply was applied to the whole field experiment. During basic fertilization, 206 kg Knd 20 kg N, 36 kg P ha -1 were used on the soil. While forming the ridges, we used an additional 25 kg N, 45 kg P and 62.5 kg K ha -1 . We adopted drip tape irrigation on the experimental field. After the planting, from the 8th week of the vegetation, another 21 kg ha -1 K, 10 kg ha -1 MgSO 4 , and 2 kg ha -1 Ca(NO 3 ) 2 was added in one dosage weekly, until the 13 th week of vegetation. At the evaluation of the experiment, we examined the yield regarding the whole experimental plot. SPAD and fluorescence measurements were carried out on 08.16. 2019, 08.28.2019, and on 09.13.2019, during the watering break. To demonstrate the difference between the dates, we applied ANOVA and Tukey post-hoc tests. For the measurement of phytonutrients HPLC, a liquid chromatograph was used, where the carotenoid content of the Ásotthalmi 12 cultivar was determined in connection with the different production methods. Test results showed that twin rows production leads to a nearly 30% greater yield, than single row production. We determined, that the growth of yield correlates negatively to the ß-carotene content of the Ásotthalmi 12 cultivar sweet potato.
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    TételSzabadon hozzáférhető
    The effect of different shading net on the Quantum Efficiency of PS II in chilli pepper cultivar ‘Star Flame’
    (2019-12-15) Agyemang Duah, Stella; Nagy, Zsuzsa; Helyes, Lajos
    The study was undertaken to identify the effect of different shading net on the quantum efficiency of PS II on ‘Star Flame’ chilli pepper (Capsicum annuum) over a period of time cultivated under plastic house environment. ‘Star Flame’ pepper was grown under red shading net and samples without shading were used as control. Analysis of photosynthetic activity revealed a significant difference (p<0.05) between Fv/Fm values in control and red shading at the end of July (p = 0.031) after the first harvest. Chlorophyll fluorescence parameter Fv/Fm reflects the maximum quantum efficiency of photosystem II (PS II) used in the detection of early stress in plants .  
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    TételSzabadon hozzáférhető
    Effect of harvesting time on the vitamin C content and yield of chili pepper
    (2023-06-05) Silva e Souza, Clarice; Agyemang Duah, Stella; Pék, Zoltán; Ráth, Szilvia; Helyes, Lajos; Daood, Hussein
    For thousands of years, chili pepper has been used in cooking intensifying the aroma, colouring, and even flavouring with its pungency. Today ,it is also of interest for the various food and pharmaceutical industries due to its intrinsic characteristics. These characteristics of pepper and its yield can be affected by both the variety and the temperature fluctuation throughout the harvest period. The current work's objective was to investigate the effect of harvest time on vitamin C of different varieties of chili pepper C. frutescens and C. annuum cultivated in Hungary, as well as the yield of pepper in different harvesting periods. Vitamin C was determined by HPLC protocols. The differences between harvest times and varieties were analysed using Tukey post hoc test at 5%. All varieties showed fluctuation of vitamin C level, depending on the given harvest date. At the last harvest, all varieties had higher vitamin C content. All varieties had the same yield trend throughout the year but with different yields between each. Variety Hetényi Parázs had the highest vitamin C content and yield: 3720.53 µg g -1 vitamin C and 18.63 t ha -1 average yield, respectively.
  • Nincs kép
    TételKorlátozottan hozzáférhető
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    TételSzabadon hozzáférhető
    Effect of net shading technology on the yield quality and quantity of chilli pepper under greenhouse cultivation
    (2021-06-01) Agyemang Duah, Stella; Nagy, Zsuzsa; e Souza , Clarice Silva; Pék , Zoltán; Neményi , András; Helyes, Lajos
    This study was undertaken to identify the effect of net shading technology on the total capsaicinoids, vitamin C and relative chlorophyll content expressed as SPAD (Soil Plant Analysis Development) values and total marketable fruit yield of ‘Star Flame’ chilli pepper ( Capsicum annuum ) for two harvesting times cultivated under modified atmosphere. ‘Star Flame’ pepper was grown under three (3) different net shading colours (white, red and green). Samples without net shading were used as control. Samples were subjected to chromatographic analyses using HPLC for the determination of total capsaicinoids and vitamin C. Interaction in shading technology and harvest times (p=0.010) had significant effect on total capsaicinoids as a result of green and white shading technologies showing higher differences when compared to control samples. Vitamin C content was observed to have increased in white and red shadings (p=0.001) after the first harvest and gradually decreased after the second harvesting time (p=0.002). Relative leaf chlorophyll content was significantly higher in white shading in the first and second harvest. Samples used as control had significantly higher marketable values when compared to white and green shadings with red recording low marketability of ‘Star Flame’ chilli peppers.
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    TételSzabadon hozzáférhető
    Effect of plant growth promoting Rhizobacteria (PGPRS) on yield and quality of processing tomato under water deficiency
    (2020-12-01) Andryei, Bulgan; Horváth, Kitti Zsuzsanna; Ráth, Szilvia; Nemeskéri, Eszter; Neményi, András; Pék, Zoltán; Helyes, Lajos
    Chlorophyll fluorescence was measured of H1015 tomato hybrid with different bacterial treatments (B0–B1–B2–B3) and three irrigation treatments: regular irrigated (RI), deficit irrigated (DI) and non-irrigated conditions (I0). The aim of the experiments was to show the effects of plant growth promoting rhizobacteria on the yield, dry matter and vitamin C content of processing tomato during different irrigation treatments, and measuring the chlorophyll fluorescence during the ripening and development stages. According to the results, none of the bacterial treatments had a statistical effect on the quantity and quality of the tomato and on the chlorophyll fluorescence, only the irrigation. Further studies are needed.
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    TételSzabadon hozzáférhető
    The effect of water supply for yield formation of processing tomato
    (2012-11-13) Helyes, Lajos; Pék, Zoltán
    The effect of irrigation on tomato yield depends on the actual weather conditions, basically the air temperature and precipitation (quantity and dispersion). The irrigated plants gave a significantly higher yield, and rainfed plants showed a yield loss. The optimum water supply treatment gave a significantly higher proportion of lycopene than the control (rainfed) treatment (89% and 80% respectively) in case of Brixsol F1 variety. In spite of this we have not found significant difference in case of Strombolino F1 (cherry type). Content of total poly-phenols measured in Strombolino F1 (cherry type) was significantly higher than that found in the Brixol F1 (normal type). The optimum water supply treatment resulted in a significantly lower content of total polyphenols in both years. Tomato fruits are rich in polyphenols the largest amount of which is rutin from among the identified components.
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    TételSzabadon hozzáférhető
    Effect of Water Supply on Spectral Traits and Their Relationship with the Productivity of Sweet Corns
    (2019) Nemeskéri, Eszter; Molnár, Krisztina; Rácz, Csaba; Dobos, Attila; Helyes, Lajos
  • Nincs kép
    TételKorlátozottan hozzáférhető
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    TételSzabadon hozzáférhető
    impact of cultivar and irrigation on yield, leaf surface temperature and SPAD readings of chili pepper
    (2020-12-01) Silva e Souza, Clarice; Agyemang Duah, Stella; Neményi, András; Pék, Zoltán; Helyes, Lajos
    Paprika is an extremely popular and widespread plant species in Hungary. Chili peppers belongs to paprika and it can be consumed fresh or processed. The production of peppers began with the cultivation and control of some parameters for good results of paprika production. The aim of this article is to compare the water supply of four chili pepper hybrids ("Habanero", "Hetényi Parázs", "Unikal" and "Unijol") by means of investigation on open field and to examine how different temperatures and water stress factors influence the yield of chili peppers. The experiment area consisted of four different hybrids in three different irrigation treatments (control, deficit- and regular irrigation). The chlorophyll content was estimated with SPAD and the leaf surface temperature with Raytek MX4 TD. Our research concluded that deficit irrigation produced the highest yields for all cultivars and the lowest yields for the highest water supply.
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    TételKorlátozottan hozzáférhető
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    TételKorlátozottan hozzáférhető
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    TételKorlátozottan hozzáférhető