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How to prevent and control rose downy mildew? These methods you need to master
Downy mildew is a fungal infectious disease. Rose downy mildew develops quickly and is extremely harmful, making it a devastating disease. It mainly affects new shoots and leaves in the middle and lower parts of the plant. In the early stage, chlorotic spots appear on the underside of the lower leaves, and the spots are irregular and covered with a frost-like mold layer. Later they turn dark purple, resembling water-soaked areas, until they become brown. The spots are polygonal and gradually become scorch-like. When the damage is severe, all the leaves drop and the plant dies. Control measures 1. Plant at a reasonable density, no more than 12 plants per square meter, and
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How to grow azaleas with soilless culture? Master these key technical points
1. Preparation of the substrate. Azalea roots are very fine and require a loose substrate to facilitate aeration and drainage. Mix 1 part vermiculite, 1 part perlite sand, 1 part river sand, and 1 part coal cinder in proportion. After mixing the substrate, sterilize it with a 0.1% carbendazim solution, stir it evenly into the substrate, and cover with plastic film for 1 day. Then rinse it multiple times with clean water, and after air-drying, mix it evenly with a 0.4% agricultural compound fertilizer solution, then cover with plastic film for one month, after which it can be used for potting. 2. Preparation of the nutrient solution. Azaleas have relatively strict fertilizer requirements. During the growing period, apply light fertilizer frequently.
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Detailed explanation of key spruce seedling cultivation techniques, easily master the seedling cultivation method
Spruce belongs to the genus Picea in the family Pinaceae. It is an evergreen tree that can reach a height of 30 m and is the main tree species in the mountain forests of our region. Spruce wood is light, soft and fine-textured, and can be used for construction, furniture, papermaking and other timber, and it is also an ornamental tree. I. Cutting propagation The cutting time should be after new shoots emerge in early spring. Cut 15 cm long cuttings and carry out cutting propagation in a plastic greenhouse. In order to raise the ground temperature, fresh horse manure can be placed under the bed to maintain a ground temperature of 25-35°C, and the humidity should preferably be around 90%. The plastic greenhouse should be tightly covered and not opened frequently, so as to avoid lowering
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How to apply top dressing in the later stage of edible fungi? These methods must be mastered
In the later stage of mushroom fruiting, in order to enhance the stamina for fruiting, mushroom growers often use various means to add nutrient solutions for top dressing. But only by using the correct method of addition can the expected goal be achieved. Otherwise, it is like pulling up seedlings to help them grow, achieving the opposite effect and bringing losses to producers. 1. Pay attention to the method of addition. There are usually three methods for adding nutrient solution: spraying, soaking and filling holes. The time for spraying nutrient solution is suitable when fruiting bodies appear in large numbers. When spraying, care should be taken that the nozzle is not directly facing the fruiting bodies, and at the same time pay attention to the "four no-spray" rules:
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How to choose a site for Schisandra chinensis? Master these key points for site selection
Schisandra chinensis prefers neutral or slightly acidic loam or sandy loam with a thick soil layer, abundant humus, a loose and fertile texture, year-round moisture retention, and a low groundwater table, on flat land or shady slopes. It requires good ventilation and light, along with irrigation and drainage conditions. Schisandra chinensis is not drought-tolerant; it likes moisture but cannot withstand waterlogging. On waterlogged low-lying land or soil that stays excessively wet for long periods, its growth vigor is relatively weak. Therefore, when cultivating Schisandra chinensis artificially, plots with good drainage that do not easily accumulate water should be chosen. Sloped land should preferably not exceed l0 degrees.
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Detailed Explanation of Schisandra chinensis Seedling Cultivation Techniques, Master All the Key Methods
Schisandra chinensis, as a traditional Chinese medicinal herb, is the finest among the Schisandra species, mainly growing in the eastern mountainous areas of Liaoning Province. In recent years, the price of Schisandra has risen in the market, with supply falling short of demand. The main reasons are: first, as China joined the WTO, the export volume of traditional Chinese medicinal herbs increased, and market demand for Schisandra grew; second, with the development of animal husbandry, the wild resources of Schisandra have been damaged, especially since goats like to eat Schisandra. In the past two years, artificial cultivation of Schisandra has begun in Liaoyang, Dandong and other areas, but due to immature seedling cultivation techniques, many farmers cannot produce seedlings or have very low germination rates.
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How to manage cotton during the flowering and boll-setting stage? Jinnan District Agriculture and Forestry Bureau reminds cotton farmers to master the techniques
The flowering and boll-setting stage of cotton in Tianjin generally begins in early July and ends at the end of August, lasting 55 days. According to surveys, most of the cotton fields in our district have entered the flowering and boll-setting stage. Field management during the flowering and boll-setting stage is very important. This period is when cotton grows and develops most vigorously, and it is a period of intricate and complex contradictions among vegetative growth and reproductive growth, individuals and populations, and the cotton crop and the environment, so it is the period that determines yield. Cotton field management during this period should focus on doing the following key tasks well: 1. Increase potassium fertilizer application. Increasing
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Autumn fishing has its finer points: these key tips you need to master
1. Pay attention to weather conditions: Autumn seine fishing must be done on a sunny day, when the weather is cool, around dawn before the pond fish surface for air, because at this time the impact on the pond fish is smallest, and the freshly caught fish can be supplied to the morning market in time. Hazy, muggy weather is not suitable for seine fishing, to avoid causing a large number of dead fish. In addition, when the pond fish are surfacing for air or there is fish disease, etc., it is also not suitable to seine and catch them. 2. Restrict feeding before catching: After fish eat their fill, their oxygen consumption increases, and when the net is drawn to catch them they will be startled, jump and dart away, which easily causes death
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Detailed explanation of large icefish processing technology, mastering the key operation points
Large icefish, also called noodle fish, was originally widely distributed in the main stream and affiliated lakes of the middle and lower reaches of the Yangtze River. Its flesh is tender and delicious, rich in nutrients, and eating it gives a special fresh cucumber-like aroma. Large icefish generally has a body length of about 20 cm, with no bones or spines, and is a small valuable fish with very high economic value, deeply welcomed in domestic and international markets. From 1985 to the early 1990s, the reservoir transplantation and propagation of large icefish was carried out comprehensively across our country and achieved success. Its distribution area is continuously expanding, and output is increasing day by day. How to do a good job in
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Methods to control excessive growth and promote sturdy wheat seedlings: these technical points must be mastered
When wheat seedlings grow excessively before winter, their growth period advances, nutrient accumulation decreases, and cold resistance drops, which is not conducive to safe overwintering. They can be managed by category according to the cause of excessive growth to control vigorous growth and promote sturdiness. 1. Vigorous seedlings formed by too-early sowing: the seedling leaves are slender, tillering is insufficient, and the main stem and some large tillers enter the double-ridge stage before winter. Such wheat seedlings are often vigorous early and weak later, and will be frostbitten in winter when exposed to a low temperature of minus 10°C lasting 5 hours. They should be pressed in a timely manner to inhibit the growth of the main stem and large tillers of the wheat seedlings and control spindly growth. Pressing should be done on a sunny morning; it must not be done when there is frost or dew
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