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  • Organic materials : sources of nitrogen in the organic production of lettuce
    Manojlović, Maja ; Čabilovski, Ranko ; Bavec, Martina
    This paper presents the results of 2 experiments: an incubation experiment anda subsequent field experiment. An incubation experimet was set up in order to determine the mineralization potential of ... different organic materials (OMs)(well-rotted farmyard manure [FTM], guano [G], soybean seed [S], and forage pea seed [P]), the kinetics of the incubation experiment were checked under field conditions in which different OMs were used as N sources for lettuce (Lactuca sativa L.). The highest mineralization rate constant k (0.127 day-1) and NM (30.12 % of total applied N) were obtained with FYM. In the field experiment in 2007 and 2008 we aaplied different OM sources that contained the same amount of potentially mineralizable N (40 and 35 kg N ha-1, respectively), calculated on the basis of k and MN. The use of OMs increased the concentration of mineral N in the soil and increased the yield of fresh lettuce. Nitrate content in the fresh lettuce was within acceptable limits both years (<2500 mg kg-1). Total N in the above-ground parts of lettuce ranged from 44.38 kg N ha-1 (ø, treatment without fertilization) to 67.45 kg N ha-1 (S) (2-year average). The results show that when determing the quantity of OM to apply it is necessary to take into account the quantity of potentially mineralizable N in order for the plants to use N as efficientlyas possible, to regulate the nitrate content in fresh lettuce, and to control the quantity of residual mineral N in the soil at the end of vegetation period.
    Vir: Turkish journal of agriculture and forestry = Türk tarìm ve ormancìlìk dergisi. - ISSN 1300-011X (Letn. 34, 2010, str. 163-172)
    Vrsta gradiva - članek, sestavni del
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 2906412
    DOI

Vnos na polico