Abstract:

In order to study the effect of chemical fertilizer dose on nutrient absorption and utilization of vegetable cultured in organic substrate, through the experiment in different methods of fertilizer application, the effect of different fertilization amount on the absorption, content and utilization of nutrients for lettuce grown with vinegar residue substrate in pot was researched. The results showed that the content of N, P and K in root and leaf in lettuce increased as the fertilization amount increased. However, the absorption of N, P and K in leaf in lettuce showed as 1/4s>1/2s>1/8s>1s>0s (0, 1/8, 1/4, 1/2, 1 units of normal fertilizer concentration). 1/8 unit fertilizer amount treatment has the highest fertilizer-N, P and K use efficiency, while 1/4 unit fertilizer amount treatment has the highest fertilizer-K use efficiency, as well as the total nutrient use efficiency. So it was suggested that 1/4 unit fertilizer amount treatment was suitable for lettuce grown with vinegar residue substrate.