How to distinguish old corn from new corn? How to choose corn? In what environment does corn grow?
How to distinguish old corn from new corn
1. Look at the corn kernels. Fresh sweet corn is not broken, full and shiny, and a pinch of nails can splash out. If it is old, the corn kernels will dry and collapse.
2. Look at the corn stalks. Mainly depends on whether the fracture of corn straw is fresh. If there is rust, it must have been left for a long time; If it's black, you can't have it.
3. Look at that corn stigma. If the corn must be tied up and neat, it will be fresh. If corn must look like grass, it means that corn is older.
4. Look at these leaves. The leaves outside are green, without yellow leaves and dead leaves. It doesn't matter if there are a few aphids, but there can't be corn borers.
How to distinguish old corn from new corn and how to choose corn?
How to choose corn?
1. The beard of corn is dry and black, indicating that the old corn is relatively light dark brown, indicating that it is tender corn, and some may not be mature.
2. Many corn sold in the market are peeled. If you find that the grains of this corn are a little dry, it means that this corn is not fresh and has been left for a long time. It's best not to buy it.
Many people think that corn bitten by insects is sweet and delicious, but experts tell us that you'd better eat less of this kind of corn with pests and diseases.
Everyone knows that dried corn is moldy and can't be eaten because it will produce aflatoxin, a carcinogen. Fresh corn also has this moldy situation, so you must choose carefully when you buy it.
How to distinguish old corn from new corn and how to choose corn?
In what environment does corn grow?
1. Maize is a thermophilic crop, which needs higher temperature throughout its growth period. The biologically effective temperature of maize is 65438 00℃. Seed germination needs 6- 10℃, and germination is slow below 10℃.
2. Maize has strong photosynthetic capacity and high light saturation point. Generally speaking, the photosynthetic intensity of maize is 35-80mg CO2/dm2 leaf hour. Because of its tall plants and large leaf area, corn needs more water. The optimum precipitation for maize growth period is 465,438+00-640 mm, and drought affects maize yield and quality.
3. Maize is a short-day plant, which can blossom and bear fruit in short-day (8- 10 hour). Spectral components have great influence on the development of maize. According to research, short-wave light such as blue light develops rapidly in the daytime, while long-wave light such as red light develops rapidly in the morning or evening.
How to distinguish old corn from new corn and how to choose corn?
What is the market price of corn?
How much is a kilo of corn? Corn has different prices in different places. The price of corn in 0 yuan 1.65438+ a catty, Suzhou 0.85 yuan, Wuxi wholesale market 0.9 1 yuan, Tianhui supermarket 65438+ a catty of 0.4 yuan, Beijing 65438 2.9 yuan, Hubei Wuhan 65438+ a catty of 0 yuan.