Uticaj različitih odnosa azota, fosfora, kalija i sorte na prinos i kvalitet salate (Lactuca sativa L.) uzgajane na otvorenom polju
2009
Hamdija Čivić
Not adequate fertilization, and separately overdosed nitric nutrition and weak lighting during production of salad can lead to low yield and agglutination of nitrate in leaves, which are harmful to human health. Nitrates cause disorder in supply of blood with oxygen or they are attached to organic compounds by creating carcinogenic nitrozamines. The aim of this paper was to examine the influence of fertilization and cultivars on yield and quality of salad cultivated in open field. With the influence of fertilization we wanted to examine the impact of increasing doses of potassium and phosphorus on possible reduction of nitrate in old and in new leaves of salad. Polifactorial experiment with two sorts of salad: armore and mildred and two planting periods was set up by block method of random arrangement. The influence of fertilization was observed with eight variants of fertilization and one control variant without fertilization. Every observed treatment had three repetitions. Significantly high influence showed the factors fertilization and cultivars on the yield and content of nitrate in old leaves. The highest average yield of salad during spring planting period was shown in variant 3 (N100P40K200) 5,26 kg/m2, and in autumn planting period was shown in variant 6 (N100P20K150) 1,01 kg/m2. The lowest yield of salad was shown in control variants. The lowest content of nitrate in old leaves was shown outside control variant, variant 7 (N100P60K150) in both planting periods, this show positive influence of phosphorus nutrition on reduction of nitrate in the old salad leaves.
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