What sub-sectors are there in the agricultural industrial chain?

Sub-industries of agricultural industrial chain include: seeds, fertilizers, pesticides, agricultural films, agricultural machinery and tools, agricultural products processing and so on. These sub-industries are all important parts of the agricultural industrial chain, and each sub-industry has its own characteristics and development laws. For example, seed industry is the upstream of agricultural industrial chain, and its development is very important to the development of the whole agricultural industrial chain; Agricultural products processing is the downstream of agricultural industrial chain, and developing agricultural products processing can increase the added value of agricultural products and increase farmers' income.