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Translocation of diquat dibromide
105-107.Views:258The aims of our work were to answer the following questions: 1. Diquat dibromide at different concentrations is a contact or systemic herbicide? 2. if translocation occurs what is the extent and direction of it. 3. by what concentration it is translocated in hydroponics. It has been stated that diquat dibromide at different dilutions (40-5%) had systemic effect in Robinia pseudo-acacia in the fields. Its translocation has been occurred apically first, and later basipetally. The extent of translocation depended on the concentration. In hydroponics diquat dibromide has crytallized on the leaf surface of Galinsoga parvif lora and all concentrations (40-0.078%) proved lethal. Recognition and application of systemic characteristics of diquat dibromide is reported here for the first time. Improvement of application method is in the focus of our future work.
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Effect of various growing media on growth and yield of lettuce in hydroponics system at Lalitpur, Nepal
41-47.Views:178Hydroponic farming, particularly using the nutrient film technique, is gaining traction as a sustainable approach for cultivating leafy vegetables such as lettuce. However, the selection of appropriate growing media remains critical for optimizing plant growth and yield in a soilless system. A completely randomized design (CRD) was used in this study to assess the impact of six distinct growing media (sponge made up of cellulose, perlite, saw dust, sand, cocopeat, and rice husk) on the growth and yield of lettuce under NFT conditions at Mutha Agro Pvt. Ltd., Lalitpur, Nepal. Analysis of variance (ANOVA) in RStudio (v4.4.1) was used to examine the data, and Tukey HSD test was used to differentiate treatment means at a 5% significance level. Lettuce grown in sponge media exhibited the highest performance in terms of number of leaves (11), longest leaf length (17.55 cm), greatest leaf width (9.43cm), plant height (35.81 cm), root length (12.51 cm), canopy diameter (36.07 cm), and stem diameter (0.62 cm). The highest fresh root weight (24.67 g) and moisture loss (98.7%) were obtained by perlite. The highest yield was recorded in sponge (146.45 g), followed by perlite (139.65 g), while the lowest was observed in rice husk (117.83 g). Overall, sponge made up of cellulose proved to be the most effective growing medium for hydroponic lettuce cultivation using NFT, followed by perlite. These findings can help guide growers in selecting suitable substrates to improve yield and quality in hydroponic production systems.
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N:K ratio and its effect on paprika yield and quality in hydroculture
35-38.Views:306Earlier results of experiments with paprika grown in soil have shown the high sensitivity of the crop to nutrient supply. According to these findings, yield and also fruit quality are highly affected not only by the nitrogen and potassium level, the concentration of nutrient solution, but also by the nitrogen-potassium ratio. Our preliminary tests have also proved, that the composition of the nutrient solution, first of all, the N/K ratio has a definite effect on the yield quantity and quality. Therefore we have investigated the ratio of the two nutrients with the aim of developing a nutrient solution of optimal composition for white fruited paprika forcing. The most balanced burden of the plants was found when the N/K ratio was 1:1. The highest yield was produced with N/K 1:1.3. Significant yield reduction (30%) was found with the treatment N/K 1:1.9 as compared to the 1:1.3 and 1:1.6.
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The utilisation of nutrient elements in soilless cultures of vegetable production
47-49.Views:373Vegetable production in greenhouses may impair the ecological balance of the environment substantially as far as being uncontrolled. Soilless cultures especially should be handled thoughtfully. A fraction of the nutrients administered, more than 25-30%, is doomed to be lost in an open system, and the resulting ecological risk is accompanied with increasing costs of the production. Experiments have been conducted with the purpose of estimate the amount of nutrients involved. According to the results, as a mean, 30-80 per cent of the main nutrients was utilised. The rate of nutrient utilisation is influenced by the plant species involved as well as by the circumstances of production. One of its most important components is the irrigation, which determines the amount of overflow and of its salt content.
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Storability of paprika varieties measured by non-destructive acoustic method
49-53.Views:239During our experiments, the storability of paprika (Capsicum annuum) samples was measured by a non-destructive acoustic method. The aims of our work were the determination of the applicability and reproducibility of the acoustic stiffness method for paprika, the investigation of the optimum measuring conditions. In order to compare the main paprika varieties regarding shelf-life, our further aim was to follow the softening phenomenon or textural changes (i.e. changes in stiffness) of different paprika varieties measured by the nondestructive acoustic stiffness method. Five different varieties of paprika grown in hydroponics growing system were used for the measurements. All paprika varieties were stored at 20 °C for two weeks. Samples were tested on every 2nd or 3rd day. The acoustic method was found to be suitable to follow the softening of paprika samples. The characteristic frequency of the acoustic signal could be well detected and clearly separated from the other vibration peaks. Tapping the top of the paprika was observed to give a clearer and less noisy signal compared to the signal obtained by tapping the sample's shoulder. The acoustic results showed the same tendencies with regard to softening during storage as the impact method showed in our previous experiments.
