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| Application of Kitchen Waste Compost in Substrate Culture of Pakchoi |
| LI Qiang，YU Hongjun，AI Shuang，JIANG Weijie* |
| Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China |
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Abstract To evaluate the application effect of kitchen waste compost in soilless vegetable production，this experiment took pakchoi variety‘Jinglyu No.2’as test material；set up 4 treatments with different application ratio of kitchen waste compost and coconut coir（V/V）as 15%（T1），30%（T2），45%（T3），60%（T4）；took pure coconut coir（CK1）and coconut coir with commercial organic fertilizer（CK2）as the contrasts；and studied the effects of applying different ratio on physical and chemical properties of matrix，nutrient content，heavy metal content and growth，single plant weight and quality of pakchoi．The results showed that the bulk density and total porosity in substrate with 45%-60% kitchen waste were all within the suitable range of culture substrate，which could meet the needs of crop growth．Compared with CK1，applying kitchen waste compost had significantly increased the contents of total nitrogen，total phosphorus，total potassium，available nitrogen；and obviously enhanced the contents of available phosphorus and available potassium in substrate before planting．At the same time，each nutrient content were all increasing along with the magnified applying ratio of kitchen waste compost，while the contents of total nitrogen，total phosphorus，available nitrogen and available phosphorus were lower than those in CK2．The contents of lead，chromium and cadmium in substrates of each treatment applying kitchen waste compost were all significantly lower than those in CK1 and CK2，and were also lower than the limiting value specified by DB32/T 589—2003．The plant height，single plant fresh weight and dry weight of pakchoi were also increasing along with the enlarged applying ratio of kitchen waste compost．Those figures in T4 treatment were significantly higher than that of the other treatments，except CK2．The contents of VC and soluble sugar in T3 treatment were the highest，significantly higher than those in CK1 and CK2．
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Received: 07 January 2022
Published: 15 February 2022
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