Studies On Organic Substitute For Growing Media Of Three Kinds Of Important Pot Flower

The peat is widely used as growing medium in greenhouse production, but heavy exploitation of peat will seriously destroy the ecosystem and make tremendous pressure to the ecological environment. Finding new material to substitute for the peat has became to a very important task.In this thesis a complete research on the physical and chemical characteristics of the well composted materials such as the sawdust(of the Pinus koraiensis ), the coconut coir, the powder of maize core, the powder of soybean stalk, the powder of peanut hull and the lees was made. The feasibility of those materials being used as transplant production media, and the growth adaptability of the New Guinea Impatiens, the Cyclamen percicum, and the Euphorbia pulcherrima in them was investigated. Moreover, the effect of the amended growing media on the developing of the New Guinea Impatiens was sought also. The results indicated as follow:1.Most of the physical characteristics such as the bulk density, porosity and water-holding capacity of those selected materials fit for the soilless cultural media, and can be used as organic substitute for the peat. The organic substitutes have better buffering capacity of the acid, alkali, and the soluble salt, this means that they can make a perfect circumstance for the root system, and prevent more effectively the damage of the change of pH and EC on the root system. The sawdust, powder of the peanut hull can be used as the soilless growing media of perennial flowers because of their steady content of cellulose. The coconut coir and the powder of soybean stalk fit for the flowers with shorter growth period. While the powder of maize core and two kinds of contrast peat just can be used as growing media for the annual flowers, because their cellulose decomposed rapidly, after 18 months of decomposition, they looked like sullage with unfit bulk density and porosity.2.By the test of seed germination and the growth of seedling of 4 kinds of flowers, we find that all the materials except the lees can be used as growing media. The coconut coir and the powder of peanut hull were good media for germination, for the GI (the germination index) of 4 kinds flower seeds reached to 100. In the sawdust, coconut coir and the powder of soybean stalk, root of the New Guinea Impatiens and the Euphorbia pulcherrima cutting were better than that in peat. But in the powder of maize core, the survive ratio of the cutting even lower than that in peat.