“Have you heard of the shrimp dishes? Yao Zhuang was planted with vegetables in the shrimp pond!†Speaking of the word “rotation,†the readers may not be unfamiliar. The Modern Chinese Dictionary interpreted this as “ Rotate several crops one by one on a field."
Can shrimp is aquatic products, generally kept in shrimp ponds; and vegetables are crops, generally planted in farmland, how should the two rotate? Yesterday, the reporter heard the news and went to the Minghui South American White Prawn Fishery Boutique Park in Jiashan County, Yaoshan Town, Jiashan, to find the answer.
Shrimp pond vegetable green Yesterday noon, when the reporter went into the Minghui South American white shrimp culture boutique park in Jiashan County, he saw that 4 or 5 farmers are bending over in a shrimp pond. They are not catching shrimp but are pulling vegetables and taking care of them. Leaves. Standing on the bank of the pond, the reporter saw that there was no water in the shrimp ponds, and a ditch divided the bottom of the pond into two. The two sides of the ditch were full of vegetables. The cabbages had already reached the harvest season. The cabbages had not yet been fully rolled up.
“There are a total of more than 10 shrimp ponds here, because it was the first time to try shrimp and vegetable rotations, so only 2 were used as pilots.†According to Lu Yingming, head of the fishery boutique park, the total area of ​​the two shrimp ponds is close to 40 acres. The vegetables were planted in September this year: "Apart from the 1200 yuan, other costs are negligible. The vegetable farmers are the shrimp farmers we employ."
It is understood that the vegetables in shrimp ponds have never been fertilized, and all the nutrients needed for their growth have come from shrimp ponds. Because the relevant tests showed no pesticide residues, these vegetables were favored by a large side-dressing company. "A few days ago, they deliberately came and bought a group of greens and said that they would return after waiting for the cabbages to be rolled up. Now they have pulled out a small portion of the vegetables and sold them for more than 300 yuan." Pleasant vegetables, Luying said cheerfully.
What are the benefits of rotating crops with "shrimp rotation"? Lu Yingming told reporters that for the park, the income of vegetables can be said to be negligible, and the most important benefit of rotation is that it can effectively improve the soil of shrimp ponds and provide an excellent water quality environment for the following year's breeding: “These shrimp ponds 3 In the coming year, the soil on the bottom of the pond has become eutrophic, and corresponding measures must be taken. If it is to ask professionals to dredge, a shrimp pond will cost more than 2,000 yuan. In contrast, the cost of growing vegetables is very low, and it can be Effectively absorb excess ammonia and nitrogen in the soil."
In Lu Yingming's view, "shrimp rotation" is a new mode of shrimp pond management that can be done in one fell swoop: "The cultivation time of Penaeus vannamei is from May to September each year, which means that shrimp ponds are idle for more than half a year each year. Planting vegetables can effectively use idle shrimp ponds, and non-fertilized and non-polluted vegetables will sell better than ordinary vegetables."
In the future, the reporter can be promoted from the Jiashan County Bureau of Agricultural Economics and learned that within the county, about 12,000 mu of shrimp ponds have been idle for about half a year. Shrimp ponds are generally eutrophicated for about 3 years of continuous use. At present, shrimp farmers all use dredging methods to improve the environment at the bottom of ponds. The cost of dredging is not low.
Lu Ligang, station director of the Aquatic Technology Promotion Station of the Bureau, believes that the “shrimp rotation†is a new attempt for the management of shrimp ponds and can be further promoted if conditions permit. At the same time, he also gave guidance: “In addition to vegetables and cabbage, you can also try to grow other short-term crops. But we must pay attention to its growth cycle, do not delay the best time for the next year to put the shrimp seed. If it is large Scale 'shrimp rotation' is recommended to find vegetable base cooperation to avoid market risks as much as possible."
Can shrimp is aquatic products, generally kept in shrimp ponds; and vegetables are crops, generally planted in farmland, how should the two rotate? Yesterday, the reporter heard the news and went to the Minghui South American White Prawn Fishery Boutique Park in Jiashan County, Yaoshan Town, Jiashan, to find the answer.
Shrimp pond vegetable green Yesterday noon, when the reporter went into the Minghui South American white shrimp culture boutique park in Jiashan County, he saw that 4 or 5 farmers are bending over in a shrimp pond. They are not catching shrimp but are pulling vegetables and taking care of them. Leaves. Standing on the bank of the pond, the reporter saw that there was no water in the shrimp ponds, and a ditch divided the bottom of the pond into two. The two sides of the ditch were full of vegetables. The cabbages had already reached the harvest season. The cabbages had not yet been fully rolled up.
“There are a total of more than 10 shrimp ponds here, because it was the first time to try shrimp and vegetable rotations, so only 2 were used as pilots.†According to Lu Yingming, head of the fishery boutique park, the total area of ​​the two shrimp ponds is close to 40 acres. The vegetables were planted in September this year: "Apart from the 1200 yuan, other costs are negligible. The vegetable farmers are the shrimp farmers we employ."
It is understood that the vegetables in shrimp ponds have never been fertilized, and all the nutrients needed for their growth have come from shrimp ponds. Because the relevant tests showed no pesticide residues, these vegetables were favored by a large side-dressing company. "A few days ago, they deliberately came and bought a group of greens and said that they would return after waiting for the cabbages to be rolled up. Now they have pulled out a small portion of the vegetables and sold them for more than 300 yuan." Pleasant vegetables, Luying said cheerfully.
What are the benefits of rotating crops with "shrimp rotation"? Lu Yingming told reporters that for the park, the income of vegetables can be said to be negligible, and the most important benefit of rotation is that it can effectively improve the soil of shrimp ponds and provide an excellent water quality environment for the following year's breeding: “These shrimp ponds 3 In the coming year, the soil on the bottom of the pond has become eutrophic, and corresponding measures must be taken. If it is to ask professionals to dredge, a shrimp pond will cost more than 2,000 yuan. In contrast, the cost of growing vegetables is very low, and it can be Effectively absorb excess ammonia and nitrogen in the soil."
In Lu Yingming's view, "shrimp rotation" is a new mode of shrimp pond management that can be done in one fell swoop: "The cultivation time of Penaeus vannamei is from May to September each year, which means that shrimp ponds are idle for more than half a year each year. Planting vegetables can effectively use idle shrimp ponds, and non-fertilized and non-polluted vegetables will sell better than ordinary vegetables."
In the future, the reporter can be promoted from the Jiashan County Bureau of Agricultural Economics and learned that within the county, about 12,000 mu of shrimp ponds have been idle for about half a year. Shrimp ponds are generally eutrophicated for about 3 years of continuous use. At present, shrimp farmers all use dredging methods to improve the environment at the bottom of ponds. The cost of dredging is not low.
Lu Ligang, station director of the Aquatic Technology Promotion Station of the Bureau, believes that the “shrimp rotation†is a new attempt for the management of shrimp ponds and can be further promoted if conditions permit. At the same time, he also gave guidance: “In addition to vegetables and cabbage, you can also try to grow other short-term crops. But we must pay attention to its growth cycle, do not delay the best time for the next year to put the shrimp seed. If it is large Scale 'shrimp rotation' is recommended to find vegetable base cooperation to avoid market risks as much as possible."
Everything You Need To Know About LED Lighting
LEDs are a simple invention with huge potential to change the lighting industry for the better. Don`t know much about them? Here are three big things you need to know to get your feet under you:
1.What Does LED Stand For?
2.LED stands for light-emitting diode.
A diode is an electrical device or component with two electrodes (an anode and a cathode) through which electricity flows - characteristically in only one direction (in through the anode and out through the cathode). Diodes are generally made from semi-conductive materials such as silicon or selenium - substances that conduct electricity in some circumstances and not in others (e.g. at certain voltages, current levels, or light intensities).
2.A light-emitting diode is a semiconductor device that emits visible light when an electrical current passes through it. It is essentially the opposite of a photo-voltaic cell (a device that converts visible light into electrical current).
Did You Know? There is a similar device to an LED called an IRED (Infrared Emitting Diode). Instead of visible light, IRED devices emit IR energy when electrical current is run through them.
1.How Do LED Lights Work?
2.It`s really simple actually, and very cheap to produce, which is why there was so much excitement when LED lights were first invented!
The p-type and n-type materials are created by introducing the original material to atoms of another element. These new atoms replace some of the previously existing atoms and in so doing, alter the physical and chemical structure. The p-type materials are created using elements (such as boron) that have less valence electrons than the intrinsic material (oftentimes silicon). The n-type materials are created using elements (such as phosphorus) that have more valence electrons that the intrinsic material (oftentimes silicon). The net effect is the creation of a p-n junction with interesting and useful properties for electronic applications. What those properties are exactly depends mostly on the external voltage applied to the circuit (if any) and the direction of current (i.e. which side, the p-type or the n-type, is connected to the positive terminal and which is connected to the negative terminal).
Application of the Technical Details to LED Lighting:
When a light-emitting diode (LED) has a voltage source connected with the positive side on the anode and the negative side on the cathode, current will flow (and light will be emitted, a condition known as forward bias). If the positive and negative ends of the voltage source were inversely connected (positive to the cathode and negative to the anode), current would not flow (a condition known as reverse bias). Forward bias allows current to flow through the LED and in so doing, emits light. Reverse bias prevents current from flowing through the LED (at least up until a certain point where it is unable to keep the current at bay - known as the peak inverse voltage - a point that if reached, will irreversibly damage the device).
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