My work in the form of water-soluble fertilizers for self-rooted and grafted watermelon cultivation, applied simultaneously with irrigation, it concentrates on examining different nutrient levels during the growing season. Within that, I focused on the application of macronutrients - nitrogen, phosphorus, potassium. Therefore, I set up 4 different nutrient levels for both types of seedlings, in two replicates, of which I developed a phosphorus, a nitrogen, and a potassium overweight nutrient level, and a nutrient level in which all three nutrients were in equal proportions. The latter formed the control. In the case of both self-rooted and grafted seedlings, I was curious as to whether changes in the amount of nitrogen, phosphorus and potassium affect the yield in a positive or negative direction. I performed the cost calculations in order to determine whether the increased cultivation cost caused by the applied additional fertilizers may result in such an additional yield, and hence an increase in sales revenue that is worth increasing the amount of applied nutrients. My experiment showed that the yield of grafted plants at the beginning of the growing season, after planting, before or during the first flowering period, applied at the same time as irrigation amount of phosphorus has a positive effect, while for self-rooted plants the high potassium active ingredient applied during ripening results in the highest yield. As a result, these nutrient levels have proven to be the most profitable. In addition, the experiment demonstrated the importance of the nutrients applied through the drip tape.

watermelon, drip irrigation, water-soluble fertilizer, grafted plant

agronomy

Presentation: poster