This question is really professional, even people in the futures industry like me are hard to understand. Only those who work in the exchange or delivery warehouse are most aware of these problems, because these problems may also be variable because of the relationship between time and specific circumstances.

But I can tell you a few points. There are many grades and varieties of these agricultural products, but the varieties in futures have certain standards. If there are differences between the delivery varieties and standards of the registered warehouse receipts, they can also be treated according to the differences to make up the difference.

As for the landlord's problem, just yesterday, 2065 438+02 65438+ 10/8, hard white wheat (wt) was changed to ordinary wheat (pm). Therefore, the hard wheat contract withdrew from the Zhengshang Institute. The output of common wheat in China is large, and the revised target is basically consistent with the spot habit, which can promote the liquidity of wheat futures market, and the futures price of common wheat can better reflect the domestic wheat price level.

As for the situation of indica rice, corn, soybean and cotton, the landlord asked too carefully, and the problems of these varieties can be found in other Baidu answers.

Sit down and see a more exact answer.