在上海地区栽植长绒棉要求早熟、高产和优质。经1987～1989年三年的试种和研究,对长绒棉的生长规律和主要栽培技术要点总结如下: 一、产量和产量结构 1987～1989年长绒棉产量中,以“9504”品系产量较高,1989年亩产皮棉51.98公斤,比1987年增产33％,比1988年仅增产1.3％;“海416”品系1989年亩产皮棉45.9公斤,比1987年增产28％。增产的主要原因,除了单铃籽棉重在年间变化不大外,而其它因素左右着产量高低。如“9504”品系在1989年的亩铃数比1988年少0.1万只,但衣分率却提高2.1％,僵瓣率少,故仍增产;“海416”品系呈同样的规律(表1)。说明长绒棉的铃重在年间变 Planting long staple cotton in Shanghai requires precocity, high yield and quality. From 1987 to 1989 three years of trial planting and research, the growth of long-staple cotton and main cultivation techniques are summarized as follows: First, the yield and yield structure In 1987 to 1989, the yield of long-staple cotton, “9504” line yield Which was 51.98 kilograms per mu in 1989, an increase of 33% over 1987 and an increase of 1.3% over 1988; the “Hai 416” strain produced 45.9 kilograms of lint in 1989, an increase of 28% over 1987. The main reason for the increase in production, except for single boll-seed cotton, did not change much during the year, while other factors dominated the production level. For example, the number of “9504” strains in 1989 was lower than that of 1988 by 0.1 million, but the percentage of clothes increased by 2.1% and the rate of rigid-petals was low. Therefore, the yield of the “9504” strain still increased. The “Hai 416” . Explain the boll weight of cotton in the year change