When farmers head to the countryside, they often ask their friends in agriculture whether it's safe to apply pesticides during the flowering stage of crops. The answer to this question requires careful consideration from multiple perspectives. It's essential to take into account the type of pesticide, its toxicity, and how long it remains in the environment. Additionally, the concentration and dosage at the time of application must be properly managed. Farmers should also pay attention to the timing of pesticide application, especially when dealing with flowering crops.
First and foremost, the use of highly toxic pesticides should be avoided. During the flowering period, crops are in a crucial phase for fruit and grain development. Most nutrients absorbed by leaves and stems are transported to the fruits or grains, making this stage particularly sensitive. Therefore, it's important to use high-efficiency, low-toxicity, and low-residue pesticides. Avoiding highly toxic and long-lasting chemicals is essential to prevent contamination of the final product. This is especially critical for food crops, vegetables, and fruits, as any residue could pose health risks to consumers.
Secondly, some pesticides can cause phytotoxic effects on flowering crops. For example, cucumbers, watermelons, and eggplants are sensitive to the herbicide acetochlor. During the flowering stage, young plants may absorb the chemical, leading to damage. Spraying should be done carefully—preferably in calm weather with moderate temperatures, and avoiding direct contact with sensitive crops. Another example is profenofos, which is widely used to control rice leaf rollers. However, it should only be applied before the rice enters the heading stage. If used during flowering or grain filling, it can cause an unpleasant odor, reducing the quality and export potential of the rice.
Profenofos can also cause problems when applied to vegetables. Improper use may result in strong odors, making the produce inedible. These issues highlight the importance of following guidelines and using the right products at the right time.
Third, timing is key when applying pesticides during the flowering period. Applying them at the wrong time can interfere with pollination or even cause phytotoxicity. For instance, late rice typically flowers between 9 a.m. and 2 p.m., with peak activity between 10 a.m. and 12 p.m. At this time, the flower opens, and pollen is released. If pesticides are sprayed during this window, they can enter the flower, killing the pollen or ovary and affecting fertilization. To avoid this, spraying should be done after 3 p.m., once pollination has completed and the flower has closed.
Cotton usually blooms in the morning. Spraying in the early hours can reduce the osmotic pressure of the stigma, causing pollen to burst and leading to flower drop. Therefore, cotton should be treated after 4 p.m. Soybeans typically flower around 6 a.m., with most blooming between 8 a.m. and 10 a.m. Very few flowers open in the afternoon. Windy days may cause earlier flowering, while cloudy conditions delay it. Pollen germinates before the flower opens, and the corolla remains open for about 15–20 minutes. Experiments show that spraying at 6 a.m. with dew can reduce yield by about 10%. Therefore, soybean spraying should be done after 3–4 p.m.
Wheat and broad beans should not be sprayed during full bloom; instead, applications should occur before or after the flowering stage.
Fourth, it's important to avoid high concentrations or excessive doses of pesticides during flowering. At this stage, the reproductive organs are still developing and more vulnerable. The concentration and volume of the solution should be adjusted accordingly to prevent damage to the crop.
In addition, during dry or rainy weather, it's best to minimize the use of powdered pesticides. Instead, emulsifiable concentrates or wettable powders should be used, with increased water content to reduce the risk of harm to the crop. This approach helps protect the flowers and ensures better crop health.
Tof(Time-of-flight), is JRT new product, which is a single-point LiDAR sensor. With a micro size of 46x17x7mm, customers can widely use in many Laser Measurement Solutions. The lidar distance sensor can measure 12m short-range. It's great for Unmanned Aerial Systems.Contact Us Now for data sheet.
| Product Name | Tof LiDAR Sensor |
| Model Number | IT02S-65-A/IT02S-65-B/IT03M-650 |
| Measuring Range (without Reflection) | 0.1-12m/0.1-10m/0.1-15m(90% reflectivity) |
| Place of Origin | China |
| Accuracy | 2cm~4cm/5cm |
| Blind Area | 10cm |
| Resolution | 1cm |
| Measuring Unit | centimetre |
| Laser Class | Class II, red |
| Laser Type | 650nm, <1mW |
| Communication Interface | UART, 115200bps(default) |
| Size | 46*17*7mm/50*26*13mm |
| Weight | About 4g/10g |
| Voltage | 2.7V~+3.6V |
| Electrical Level | TTL/CMOS |
| High Frequency | 100hz |
| Operating Temperature | 0-40 ℃ (32-104 ℉ ) |
| Storage Temperature | -25~60 ℃ (-13~140 ℉) |
ToF Sensor,Time of Flight Sensor,LiDAR Distance Sensor,ToF Distance Sensor
Chengdu JRT Meter Technology Co., Ltd , https://www.jrt-measure.com