Lettuce production in a greenhouse with drip fertigation fractioning

Abstract

This research presents results found for fertigation through drip on lettuce. Variety grown in a greenhouse. The respective treatments were: (F1), 100% of the nutritional demand required by the crop was provided at the time of planting; F2 in the treatment, 50% of fertilization occurred in the early planting and 50% complementary to the middle of the cycle, the expected timing of the harvest was 40 days after planting; F3 was fractionated treatment: being 1/3 of fertilizer at planting, 1/3 after 13 days and the last application after 26 days from the time of planting; F4 treatment followed the same reasoning, by dividing the application into 4 parts of 10 for 10 days. The design was completely randomized with three water potential levels in the soil and three replicates. It was found that the lowest water potential of the soil (P3) presented higher production of green mass for smaller numbers of fractioning of fertigation. On average, higher laminae resulted in lower green mass production.