Screening of tomato plug seedling substrates proportion suitable for mech-anized transplanting
The composted livestock manure, mainly used as the organic substrate, was mixed with peat, vermicu-lite, perlite. Nine kinds of substrates with different volume ratio were formulated and used to cultivate tomato plug seedlings ( Lycopersiconesculentum Mill) . Then the plug-seedlings were transplanted by a mechanical transplanter. The physical and chemical properties of the substrate, emergence rate, the growth index of the tomato seedlings, scattered lump rate, as well as the results of mechanized transplanting were characterized. According to the above results, these nine substrates were e-valuated comprehensively in order to select the appropriate organic substrate for tomato plug-seedlings suitable for mecha-nized transplanting. The results showed that the bulk density and air-water ratio of the nine formulated substrates were in the range of ideal substrates. The substrates slightly tend to be alkaline, which could meet the tomato growth needs. With the increasing of the composted livestock manure volume, the general porosity, ventilatory porosity, water retention porosity, cation exchange capacity (CEC),and N, P, K content of the substrate displayed the decreased tendency. While, bulk density, air-water ratio, pH,electric conduc-tivity( EC) and organic matter content displayed the in-creased tendency. The growth and physiological indexes of tomato plug-seedlings nurtured with 50％ composted livestock manure showed the better level than that nurtured by CK. The tomato plug-seedlings under the treatment of S7 ( composted livestock manure : vermiculite : perlite : peat = 5 : 2 : 1 : 2), showed the best growth level with 5.56％ scattered lump rate, and more than 94.30％ qualified rate,which was suitable for mechanized transplanting.
tomatoplug seedlingmechanized transplantingquality of seedlingcomposted livestock manure
NETL
NSTL
万方数据
维普
