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湖北应城市田店镇刘先平读者来信说:我是一个农村青年,经常在《农家顾问》上读到余宏章老师的文章,受益匪浅。今冒昧地向余老师请教几个问题,望在百忙之中给予解答。(1)棉花种子F1代与F2代有什么区别?F2代种子能否做种?(2)适合应城市种植的抗虫棉品种有哪些?获得高产要采用什么栽培技术?(3)是自己混配氮、磷、钾肥好,还是购买复合肥好?(4)油菜品种繁多,到底种哪一个系列的品种好?(5)应用除草剂要注意哪些问题?
Liu Xianping, Tiandian Town, Yingcheng City, Hubei Province, wrote in a letter: “I am a rural youth. I often read the article from Teacher Yu Hongzhang on” Farm Advisor "and benefited a lot. Now take the liberty to ask a few questions to Yu teacher, hope to give answers in his busy schedule. (1) What is the difference between F1 and F2 generation of cotton seeds? Can F2 seeds be used for planting? (2) Which varieties of insect-resistant cotton are suitable for urban planting? What cultivation techniques should be adopted for obtaining high yield? (3) Mixed with nitrogen, phosphorus, potassium is good, or to buy compound fertilizer is good? (4) rape variety, in the end what kind of series of good? (5) the application of herbicides should pay attention to what the problem?