One, choose the variety
Choose varieties that are suitable for consumers' taste and relatively long picking period, and have good yield, suitable sweetness, pure fragrance, soft texture, rich nutrition, consistent ear size, thin seed coat, yellow kernels, white cobs, and seeds Varieties with high germination rate, strong seedling vigor, good resistance, and strong lodging resistance can be sown in stages. The method of staged sowing with early, mid- and late-maturing varieties can extend the picking supply period to increase efficiency. Open field cultivation can be planted from late March to early August. Greenhouse and plastic greenhouse planting can be planted earlier or later. Generally, planting a batch of five months in spring and 15 days in summer and autumn can make the annual supply of sweet corn go on the market one after another.
Two, isolation planting
In order to prevent hybridization with other corn varieties, reduce sweetness and affect quality, sweet corn must be planted in isolation. The isolation area is required to be more than 400 meters, and time difference isolation can also be adopted, and the flowering period is required to differ by more than one month.
The fine seedlings of sweet corn have shriveled seeds, poor ability to germinate and top soil, low germination rate, weak growth potential of seedlings, and higher soil requirements. Generally, deep turning, rake leveling, and fine crushing are required to make the soil loose and have good moisture content, and to create a suitable soil environment for seed germination and seedling growth. Seeds must be carefully selected to remove insect seeds, bad seeds, and mold seeds. When planting, the soil moisture should be suitable, and the planting should not be too deep, and the soil should be about five centimeters. At the same time, ensure that the depth of the soil is the same, and strive for all seedlings. Apply foot fertilizer between the holes, and pay attention to the prevention and control of underground pests. You can use 50% phoxim to dress the seeds or irrigate the roots.
3. Field management
Under the condition of general soil fertility level, phosphorus and potassium fertilizer are applied as base fertilizer at one time. Water management should pay attention to preventing waterlogging in the seedling stage and preventing drought in the middle and late stages. Due to the slow growth of sweet corn, the seedling stage is prone to weeds, so we must be cultivated early to eliminate weeds. Prevent corn borer in time from jointing to big bell mouth, use low-toxic pesticides such as phoxim, and control it during the small bell mouth stage. Use pesticides with caution, less use, and early use, which can effectively control pests without leaving pesticide residues. And affect the quality of corn. Sweet corn is filled to milk maturity, if there are aphids, BT emulsion can be used to spray the ears. Cultivating soil and pressing roots promotes growth, increases yield, and improves sweetness.
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NVR has different product forms. Although its core function is the capture, storage, management and forwarding of network video streams, different companies have different designs to complete these functions and have their own characteristics. There are mainly three types of NVR products.
The first is the PC server based NVR software product (Software Only), that is, the manufacturer provides the NVR software plus license mode, which can be installed on any standard PC or server that meets the requirements.
The second is the NVR overall solution of software and hardware integration provided by the manufacturer, that is, the manufacturer installs the NVR software on its customized PC server, which is the so-called Turnkey Solution product.
The third is embedded NVR products, namely embedded devices based on embedded hardware platforms and operating systems; In addition, there are storage management integrated devices developed by storage device manufacturers, which are not the mainstream NVR form.
In terms of stability, although the reliability of PC based NVR system is not as high as that of embedded NVR system, compared with PC based DVR system, the PC based NVR system has relatively simple functions, fewer failure links and better stability than PC based DVR system.
In terms of scalability, as the PC based NVR system is based on the general PC platform and the general operating system, its hardware interface is universal, open and standardized, which is easy to be compatible with other hardware, and software development is also relatively convenient. However, due to the high hardware integration, single interface, poor compatibility with other hardware, and weak incidental functions of embedded software, the secondary development of embedded NVR is relatively complicated.
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