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第25章 重要的经济作物。(2 / 2)

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2. 苗期:需水量较少,适度控制水分,进行蹲苗,促进根系生长,但不能过度干旱,防止僵苗。

3. 蕾期:需水量逐渐增加,要根据土壤墒情及时浇水,满足棉花生长需求,但避免田间积水。

4. 花铃期:需水量最大,此阶段不能缺水,否则会影响棉花的产量和品质,但也不能大水漫灌,防止出现徒长和倒伏。棉花的生长周期一般为 5-6 个月。到出苗一般需要 7-15 天左右。之后进入苗期,大约持续 40-50 天。蕾期约 25-30 天。花铃期历时约 50-60 天。吐絮期一般持续 70 天左右。不同地区、不同气候条件下棉花的生长周期可能会有所差异。吐絮期:需水量减少,保持土壤适度干燥,利于棉花成熟吐絮,防止贪青晚熟。

三、施肥管理1. 基肥:以有机肥为主,配合适量的化肥,施足基肥,为棉花整个生长周期提供基础养分。

2. 追肥:根据棉花的生长发育阶段进行追肥。蕾期追施适量的氮肥和磷肥,促进植株生长和花芽分化;花铃期重施氮肥和钾肥,满足棉花大量开花结铃对养分的需求。

3. 叶面施肥:在棉花生长的中后期,可进行叶面喷施磷酸二氢钾等肥料,补充养分,防止早衰。

四、病虫害防治1. 病害防治:常见的棉花病害有立枯病、炭疽病、枯萎病、黄萎病等。可通过种子消毒、轮作倒茬、加强田间管理等措施预防病害发生。一旦发病,及时采用相应的药剂进行防治。

2. 虫害防治:棉花虫害主要有蚜虫、红蜘蛛、棉铃虫等。可采用生物防治、物理防治和化学防治相结合的方法进行防治。如利用天敌昆虫、安装杀虫灯、悬挂黄板等,必要时使用高效低毒的农药进行防治。

五、整枝打顶1. 整枝:及时去除棉花的叶枝、赘芽和空果枝等,减少养分消耗,改善田间通风透光条件。

本小章还未完,请点击下一页继续阅读后面精彩内容!2. 打顶:根据棉花的长势和种植密度,适时打顶,控制棉花的生长高度和果枝数量,促进棉花多结铃、结大铃。

六、其他方面1. 中耕除草:棉花生长期间要及时进行中耕除草,保持土壤疏松,减少杂草对养分和水分的竞争。

及时排除田间积水。棉花的生长习性主要有以下几点:

一、温度要求棉花是喜温作物。生长起点温度在 10℃以上,最适温度为 25℃-30℃。在整个生育期内,特别是现蕾开花到吐絮阶段,对温度要求较高。温度过低会影响生长发育,导致蕾铃脱落;温度过高也不利于棉花生长,可能会使棉花生长过快,植株细弱。

二、光照需求

- 棉花属喜光作物。充足的光照条件能促使棉花植株生长健壮,节间紧凑,果枝多,蕾铃多,脱落少,产量高、品质好。光照不足会使棉花徒长,蕾铃大量脱落,严重影响产量。

三、水分条件

- 棉花生长既需要适量的水分,又怕田间积水。在播种至出苗阶段,土壤水分以田间持水量的 70%左右为宜,过少影响出苗,过多则易造成烂种。在现蕾以后,棉花需水量逐渐增加,花铃期是棉花需水最多的时期,此时缺水会严重影响棉花产量;但如果田间积水,又会使棉花根系因缺氧而生长不良,甚至死亡。

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