In order to investigate the effects of application of 3 and 5 consecutive periods of Compost-Like Output (CLO) on yield and concentration of N, P, K in kernel wheat and soil under planting, a greenhouse experiment was conducted in split plot based on a Randomized Complete Block Design (RCBD) with four replications in 2009. The main plot was six fertilizer levels including: control (without CLO and chemical fertilizer), Chemical Fertilizer (CF) based on soil test, 4 levels of CLO (20 and 40 t/ha without and with half of CF) and sub-plot was applying 3 and 5 continuous periods. The results showed that application of CLO significantly increased yield amendment and concentration of macro-nutrient in grain wheat and soil. Also, regarding the periods of application, it was observed that the application of CLO in five consecutive periods was more effective compared with three consecutive periods. The maximum and minimum amount of N, P kernel and soil after harvesting and number of kernel in spike were produced with application of 40 t/ha CLO with half of CF and control, respectively. The highest amount of 1000- kernel weight was observed in 40 t/ha of CLO treatment.The maximum grain yield was obtained with the application of 5 consecutive periods of 40 t/ha CLO with half of CF. Furthermore, it was observed that between CLO treatments, there was no significant difference in the concentration of k in kernel.
Key words: Consecutive periods, compost-like output, soil, wheat, yield.
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