Author/Authors :
özenç, damla b. ordu üniversitesi - ziraat fakültesi - toprak bilimi ve bitki besleme bölümü, Ordu, Turkey , şenlikoğlu, gültekin giresun orman bölge müdürlüğü, Giresun, Turkey
Abstract :
New approaches at the plant production gain importance because of the problems caused by theintensive use of agricultural inputs in traditional methods. For this purpose, materials such as plant andanimal wastes, and compost have been widely used. In this study carried out in winter season undergreenhouse conditions, the effects of organic and chemical nitrogen source on the essential nutrientcontent and nitrate accumulation of spinach (Spinacia oleracea L.) were investigated. Different doses ofhazelnut husk compost, enriched compost and farmyard manure (0 g kg-1, 20 g kg-1, 40 g kg-1, 80 g kg-1)as organic materials and 26 % CAN fertilized in the form of 15 kg pure N da-1 as chemical nitrogensource were used. In general, as well as chemical nitrogen source, compost and farmyard manureapplications have increased plant growth and nutrient content considerably. In plants where fertilizerapplication is not performed but composting is used, the N content has increased, mixing thesematerials with soil has increased the fertilizer efficiency too. The use of compost with nitrogenfertilization more increased the NO3- accumulation and K content at the plant than the animalfertilization, the highest values were found in the 80 g kg-1 enriched compost media with nitrogenfertilizer, but the highest P content was obtained in 80 g kg-1 farmyard manure media. As a result,compost applications were effective enough to compete with farmyard manure on nutrientconcentrations, and nitrate accumulation remained in the acceptable values.
