Effects of Summer Season Green Manuring on Organic Head Lettuce Production in Greenhouse
Makaleler > Tam Makale · 2013
Yazarlar: Hale Duyar
International Journal of Agriculture and Forestry, Uluslararası, 2013, cilt 3, ss 220-225
Özet
This research was carried out to determine the effects of summer season green manuring on winter season organic head lettuce (Lactuca sativa var capitata cv. Coolguard) production in unheated greenhouse conditions between 2005 and 2007. In the experiment the tested summer green manure plants were (1) soybean (Gylcine max. L. Merr.), (2) cowpea (Vigna sinensis L), (3) maize (Zea mays). Another parcel was left as control (4) without manuring. All of the plots were divided into two parcels and poultry manure was applied as 0 (-PM) and 0.75 kg m -2 (+PM ) to each one. Experimental design of the study was split plot with 3 replicates. Effects of the treatments on yield, head quality (head height (cm), head diameter (cm), total leaf nu mber (nu mber p lant -1 ), nitrate content (mg kg -1 ) and vitamin C (mg 100g -1 ) content of head lettuce together with soil fertility and available plant nutrients was investigated. Yield changed between 5459.7 and 6097.8 g m -2 , 4261.5 and 7430.6 g m -2 in the first and second years, respectively. Organic matter and nitrogen (N) content of the soil was enhanced by green manuring. Availab le nutrient content of the head lettuce plants was found in adequate level. Results showed that, due to its additional costs and considering the achieved results, it is not necessary to apply the poultry manure with green manures.