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The response of shallot plants to potassium differs substantially depending on the cultivar, organic matter, soil conditions, and weather in the cultivation area. This research aimed to determine some of the growth characteristics of a Tinombo variety of shallot following treatment with an organic fertilizer comprising manure and potassium in the area of Palu, Central Sulawesi. This research took the form of a greenhouse experiment with planting in pots arranged in a completely randomized factorial pattern. The first factor was the application of chicken manure at 0 and 10 tons.ha-1, while the second factor was the dose of KCl fertilizer: 0 kg.ha-1; 30 kg.ha-1; 60 kg.ha-1 and 90 kg K2O.ha-1. Each treatment was replicated three times. The application of potassium and manure significantly affected the accumulation of dry matter and the linear growth rate of shallot var. Tinombo. Manure applied at 10 tons.ha-1 increased the leaf area index when combined with 0 to 60 kg K2O.ha-1. However, the addition of manure increased the net assimilation rate at all doses of potassium fertilizer. The number of bulbs and harvest index were affected by the amount of manure and potassium fertilizer applied, but there was no significant interaction between these two factors. Applying manure and K2O fertilizer resulted in a significantly higher number of bulbs and a better harvest index than in those cases where the two types of fertilizer were not applied. RESUMO A resposta das plantas de chalota ao potássio difere substancialmente dependendo da cultivar, matéria orgânica, condições do solo e clima na área de cultivo. Esta pesquisa teve como objetivo determinar algumas das características de crescimento de uma variedade de chalota Tinombo após o tratamento com um fertilizante orgânico composto por esterco e potássio na área de Palu, Sulawesi Central. Esta pesquisa teve a forma de um experimento em casa de vegetação, com plantio em vasos dispostos em um padrão fatorial inteiramente casualizado. O primeiro fator foi a aplicação de esterco de galinha a 0 e 10 toneladas.ha-1, enquanto o segundo fator foi a dose do fertilizante KCl: 0 kg.ha-1; 30 kg.ha-1; 60 kg.ha-1 e 90 kg K2O.ha-1. Cada tratamento foi replicado três vezes. A aplicação de potássio e esterco afetou significativamente o acúmulo de matéria seca e a taxa de crescimento linear da chalota var. Tinombo. O esterco aplicado na dose de 10 t.ha-1 aumentou o índice de área foliar quando combinado com 0 a 60 kg K2O.ha-1. No entanto, a adição de esterco aumentou a taxa de assimilação líquida em todas as doses de fertilizante potássico. O número de bulbos e o índice de colheita foram afetados pela quantidade de esterco e fertilizante potássico aplicados, mas não houve interação significativa entre esses dois fatores. A aplicação de esterco e fertilizante K2O resultou em um número significativamente maior de bulbos e um melhor índice de colheita do que nos casos em que os dois tipos de fertilizante não foram aplicados.

This thesis is focused on an experiment dealing with fertilization of silage corn. The experiment was realized in 2021 in the agricultural enterprise Zemko Kožlí a.s. The field experiment was founded with a hybrid ES Joker and was fertilized with various combinations of fertilizers. In total, eight fertilization variants were created for the experiment in two repetitions. Fertilizers DAM 390, Urea and Amofos were used for fertilization. During the vegetation, differences between fertilization variants were monitored, namely in the number of plants, increase of above-ground biomass, weight of individual plants, weight and number of individual buds, and finally in the total yield from each variant. An additional criterion-em was the evaluation of the percentage of dry matter and the economic evaluation of each variant. The largest yield was recorded for the variant that was fertilized only with nitrogen in the fertilizer Urea. The lowest yield, on the other hand, was for the fertilized phosphorus variants in the fertilizer Amofos in combination with nitrogen in the fertilizer DAM 390. With the increasing dose of industrial fertilizers, the yield of biomass decreased. Experiments of corn fertilized with phosphorus reached higher dry matter.

This paper discusses the cooling effect of the root zone (the root zone cooling) at a floating hydroponic for the shallot production in tropical lowland by cooling the nutrient bath. The study was conducted at three different temperatures, i.e. low temperatures (8-10OC), medium temperature (13-15OC), and control (23-26OC) with variable responses that include wet weight, dry weight, number of bulbs and weight per bulb. Plant growth responses were analyzed using statistical methods Fisher's least significant difference (LSD), while the temperature distribution on a floating hydroponic was analyzed by computational fluid dynamics (CFD) simulation approach. CFD simulation approach was able to describe the temperature distribution on a floating hydroponic well, where the coefficients of determination (R2) for each treatment of low temperature, medium and controls are 0.983, 0.980 and 0.862 respectively. The results showed that the number of bulbs was the most responsive variable, where the induction of bulb formation at low temperature is more than 200% of the control temperature and more than 60% of the medium temperature.