?Sina Finance and economics news on April 21, the trend of commodity futures in the afternoon was divided, the black series was weak, the thread was slightly higher, the double coke was down by more than 2%, the iron ore was floating green; the non-ferrous metals were mixed, the aluminum in Shanghai was slightly higher, the lead in Shanghai was down by more than 2%, the zinc in Shanghai was down by nearly 2%; most chemicals were down, the rubber was up by nearly 2%, the fuel oil was down by more than 2%, the PTA was down by nearly 2%, and the methanol was down by more than 2%; agricultural products continued to rise, the sugar was up by more than 2% , cotton up, apple red. By the end of the afternoon, sugar rose 2.43%, rubber rose 2.25%, glass rose 1.43%, Zheng Mian rose 1.54%; in terms of decline, fuel oil fell 2.42%, coke fell 2.25%, coking coal fell 2.14%, PTA fell 2.33%. The cycle of white sugar rises and falls for two years and three years. Zheng sugar has a relatively clear cycle of rise and fall. It can basical期期一码特 ly summarize the law of "three years of output increase, two years of output reduction" and "two years of price rise, three years of price fall". The relationship between price and output is strong. According to the law of "increase production for three years", it is predicted that the domestic sugar production will still maintain a small increase this year, and the sugar production in 22 / 21 pressing season is likely to decrease.