The content of nitrogen, phosphorus and potassium of shallot (Allium ascalonicum L.) varieties with different method of cultivation and altitude

Differences in altitude and plant cultivation methods greatly affect the nutrient content of shallot plants. The objective of the research is to evaluate differences in the nutrient content of N, P and K in two true shallot seeds (TSS) with different cultivation methods and altitude. The study was conducted in series in the highlands (Berastagi 1295 m asl) and in Medan (32 m asl) using a factorial randomized block design. The first factor is TSS varieties (Sanren F1 and Lokananta). The second factor is the cultivation method used based on the recommendation of the seed supplier, the recommendation for double production, the modification of the recommendation of the seed supplier and the modification of the recommendation for the double production). The results showed that the location, variety, cultivation and their interactions significantly affected the N, P andK content. In both Sanren F1 and Lokananta varieties, the use cultivation method from the recommendation of the seed supplier in highlands resulted in the highest P and K content compared to other treatment combinations. The use recommendation for double production in the lowlands in Sanren F1 and Lokananta varieties resulted in the highest N content compared to other treatment combinations.