1, with different names: beans are also called beans, cowpeas and long cowpeas, which are mostly planted in the north, and green beans are also called kidney beans, framed beans, April beans and lentils, which are mostly planted in the east.
2, the leaves are different: beans have pinnate compound leaves, the leaves are rhombic, and the leaves of green beans are opposite, and the shape is mostly oval.
3. Different pods: pods are slender and drooping, about 7.5-70 cm long, mung beans are short and thick, and pods are slightly straight or curved, about 10-30 cm long.
Growing environment:
1, temperature:
Cowpea is a heat-resistant vegetable, which can resist high temperature and frost. Seeds germinate faster at 25~35℃, but germinate slower when the temperature decreases, and the germination rate decreases. The lowest temperature is 10~ 12℃. After sowing, the seedlings are unearthed at 30~35℃. After the vine is pulled out, it grows well at 20~25℃, and it can still grow around 35℃.
The suitable temperature for flowering and pod setting is 25~28℃, pods can still be set above 35℃, and the growth is slow around 15℃, and the growth is inhibited when it is lower than 10℃ for a long time, and the plants near 0℃ freeze to death. However, when the temperature is higher than 35℃ or lower than 15℃, not only the plants will be premature, but also a large number of flowers and pods will drop, and the pods will become shorter or deformed, and the quality will become worse.
2. Lighting:
Cowpea's response to the length of sunshine can be divided into two categories: one is that it is not strict with the length of sunshine, and it can grow and develop normally in both long and short sunshine seasons, that is, it can grow and pod normally in spring, summer and autumn, such as early and middle maturity cowpea varieties such as Red-billed Yan and Zhijian 28.
The other type has strict requirements on sunshine length and is suitable for seasonal cultivation with short sunshine time. For example, in the long sunshine season, the stems and vines are too long, and the flowers and pods are late, which is suitable for autumn cultivation, such as late-maturing cowpea varieties such as Hefei October Cold.