Study on the effect, absorption and distribution of NPK on tomato in greenhouse of Beijing suburbs

The effect, absorption and distribution of NPK on tomato in the greenhouse with different soil fertilities were conducted in Tongzhou, Daxing, and pinggu of Beijing. The results showed that the highest yield could be gained as N 187 5kg/hm 2 supplied on the base of manure 36t/hm 2, and yield reduced with N fertilizer increased. Phosphate fertilizer was no effect when the available P content in the soil was beyond 100mg/kg, and it was trend that tomato yield decreased with increase phosphate fertilizer in that case. Tomato yield increased by 8 2% as the rate of potash increased, even the content of available K in soil was 216mg/kg. The accumulation of dry matter of tomato was mainly in the period of rich fruits, and the average dry weights of roots, leaves, stems were 2 11%, 23 6%, 28 4%, 45 98% of total dray matter, respectively. The distribution of K in stems and fruits of tomato was excess of N and P, and N distribution in leaves was excess of in roots, stems and fruits. When the tomato yielded 67388～80960kg/hm 2, which topping after retained three branched fruit, the uptake rates of nutrients were N 177～238, P 2O 5 79～97 and K 2O 212～309kg/hm 2, and the N∶P 2O 5∶ K 2O ratio was 1∶0 41～0 45∶1 21～1 30. This result was similar compared with that of tomato in the open field.