Soilless cultivation and Management of Phalaenopsis
1. Temperature. During the period of vegetative growth, the temperature is generally controlled at 20-35 °C. The temperature required for vernalization of large seedlings is 15-18 °C. The temperature requirement from arrow drawing to flowering is 18-20 °C at night and 25-30 °C from day to day. The ornamental temperature at flowering stage should be controlled at 15-20 °C. The temperature difference between day and night is generally more than 10 °C, let alone negative temperature difference between day and night.
two。 Light. The light intensity of small seedlings (from 6 months to 6 months old) was controlled at 5000-8000 lux, that of middle seedlings (from 6 months to 1 age) was controlled at 8000-15000 lux, that of big seedlings (from 1 age to arrow drawing) was controlled at 15000-25000 lux, that of arrow seedlings was controlled at 25000-35000 lux, and that of flowering ornamental plants was controlled at 500-10 000 lux.
3. Fat water. Softened water is the best water quality. If no softening water is available, unpolluted river, river, lake and well water with a concentration of no more than 0.4 mm Siemens / cm, and pollution-free rain and snow water can also be used. Rest for one night in the cultivation facility before use.
Seedlings use 5000-fold solution of American Huaduo (30-10-10); medium seedlings use Huaduoduo (30-10-10) and Huaduoduo (20-20-20) alternately every week; large seedlings use Huaduoduo (20-20-20) once a week, 2000-fold liquid; use Huaduo (9-45-15) 1500-2000 times during flower bud differentiation The arrow seedlings were alternately used every week with 2000 times of Huaduoduo (10-30-20) and Huaduoduo (20-20-20) before flowering. After the first flower is in full bloom, it generally stops all fertilizers and supplies only a small amount of water needed for its flowering period.
4. Diseases and insect pests. Mastering the principle of "giving priority to prevention and combining prevention with prevention" should be prevented by spraying Redomir, Wanling and other mixed pesticides every other day. The common diseases are soft rot, anthrax, gray mold, etc., which can be controlled by agricultural streptomycin, mancozeb, gray frost, etc.; common insect pests are few, mainly aphids, shell insects, etc., can be controlled by Wanling, Mianhuoling and so on.
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Key points of soilless cultivation of rhododendron
1. The root system of rhododendron is very slender, which requires loose matrix to facilitate air permeability and drainage. 1 part of vermiculite, 1 part of pearl sand, 1 part of river sand and 1 part of cinder were mixed in proportion. After mixing the substrate, sterilize it with 0.1% carbendazim solution, mix it evenly into the substrate and cover the plastic film for 1 day. Then rinse with clean water for many times, dry, mix well with 0.4% agricultural compound fertilizer solution, then cover it with plastic film for a month, and then use it in the basin. 2. The preparation of nutrient solution Rhododendron has strict requirements for fertilizer. During the growing period, thin fertilizer is applied frequently.
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Symptoms and control methods of Botrytis cinerea in Phalaenopsis
Botrytis cinerea is one of the most common diseases in the production of Phalaenopsis, which often occurs in its growing season, especially in the greenhouse in winter and spring, the pathogen can infect any part of the plant. If the cultivation management is relaxed, it is more conducive to the occurrence and epidemic of the disease, and in serious cases, it can cause a large number of fallen flowers and leaves, which not only affects the flowering of the plant, but also directly reduces the ornamental value and yield of Phalaenopsis. (1) warm and humid conditions are the main conditions for the prevalence of Botrytis cinerea. That is, the relative humidity is about 90% and the temperature is about
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