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36. Die back management in mandarin orange

柑橘是全球重要的水果之一,而普通橙是其中的一种。然而,普通橙遭受到的主要病害之一是36号橙死亡病的流行。这种病害严重影响普通橙的产量和果实质量,给果农们带来了巨大的损失。 36号橙死亡病是由具有致病性的真菌Phytophthora和根结线虫引起的病害。在受感染的植株上,根部和枝干会出现病斑,随后植株会逐渐凋萎、枯死。这些病原体通过土壤和水分传播,因此其防治需要综合管理策略。 以下是一些针对36号橙死亡病的管理措施,有助于果农们控制和减轻病情: 1. 土壤改良:通过改进土壤排水性和通气性,可以减少病原体在土壤中的生存和传播。果农可以进行排水沟的规划和构建,以确保土壤中的水分不会滞留。 2. 病害预防:果农们应该采取预防措施,包括选择抗病种植材料和定期巡视园区,及早发现病害迹象。另外,定期进行农具和设备的消毒,以防止病原体通过这些工具传播。 3. 化学治疗:果农可以使用合适的化学药剂进行病害的药浴处理,以消除潜在的病原体。然而,使用化学药剂应符合农业部的相关规定,并且应谨慎使用,遵循正确的施药方法和剂量。 4.

Yellowing of Wheat in Heavy Soils after Irrigation

Yellowing of Wheat in Heavy Soils after Irrigation

Wheat is one of the most widely grown cereal crops in the world, providing a major source of food for people and livestock. However, in certain soils, wheat crops may experience yellowing after irrigation. This phenomenon can significantly reduce crop yield and quality, causing losses for farmers.

Heavy soils, also known as clay soils, are those that have a high content of clay particles, which can cause soil compaction and poor drainage. These soils are commonly found in areas with high rainfall or irrigation, and they are particularly susceptible to a number of soil-related problems.

One of the common issues associated with heavy soils is yellowing of wheat after irrigation. When wheat crops are watered with heavy soil, the soil particles become compacted, reducing the air available in the soil. Consequently, the roots of the wheat plant may become oxygen-deprived, leading to reduced nutrient uptake and stunting of the plant growth.

At the same time, the compacted soil can become waterlogged, reducing the capacity of the soil to hold and transport water. As a result, the wheat plant may experience drought-like conditions, causing leaf yellowing and eventual crop damage.

To prevent this issue, farmers should take several steps to improve soil quality before and during wheat cultivation. Firstly, it is recommended to apply a soil conditioner that can improve the soil structure and soil drainage. Secondly, proper irrigation methods should be used that help maintain optimal soil moisture without causing waterlogging. Lastly, crop rotation should be implemented to help break up soil compaction and reduce the build-up of soil-borne diseases.

In summary, yellowing of wheat after irrigation in heavy soils is a common issue that can affect crop yield and quality. Farmers should adopt appropriate soil management practices to prevent this problem, including the use of soil conditioners and proper irrigation methods. By improving soil quality, farmers can ensure healthy wheat crops and a bountiful harvest.

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