The main reason for the emergence of flower topping in greenhouse cucumbers:
Temperature misalignment type. In the early stage of planting and slowing down to the flowering and melon, if the continuous low temperature occurs, the vegetative growth of the plant is hindered, and the reproductive growth is too fast and the flower topping is prone to occur.
Roots and roots. High temperature and drought in the shed, especially when the soil is dry, due to excessive fertilizer, insufficient water, causing root burning, or the soil is too wet, but the temperature and ground temperature are low, causing the roots to be easily formed.
Water and fertilizer are not regulated. Soil conditions are uncomfortable, root activity is weak, and the ability of water-absorbing fertilizer is poor. Due to physiological deficiency, cucumber flower topping may also occur.
Control method: Reasonably regulate the temperature to prevent the temperature from being too low or too high, and maintain a suitable temperature. Timely cultivating loose soil plan to increase the ground temperature, if necessary, first apply appropriate amount of fertilizer, watering, and then loosen the soil to promote root development and lower tie. Scientific operation of fertilizer and water, greenhouse cucumber fertilizer application should be mastered in small quantities, multiple times, and uniformity. In particular, the applied organic fertilizer must be fully decomposed to prevent root damage due to improper fertilization. The amount and frequency of topdressing should be reduced as much as possible according to weather conditions. Watering in moderation to avoid flooding and flooding affects the ground temperature and causes roots. Strengthening the field management, the plants with flower topping have appeared, and the young and female flowers are removed in an appropriate amount, and the leaves are sprayed with 500 times of potassium dihydrogen phosphate. For flower topping caused by low temperature freezing damage, plant conditioners such as Bibao + alizarin can be sprayed to enhance the cold resistance of plants and promote root and plant development.
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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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