桑树生长对肥料的生理要求,夏秋季生长量大,生长周期约占全年生长量的2/3,因此,夏秋肥占全年施肥量的()。...
Thursday, April 11, 2024
养成时间较短,偏于营养生长,在良好的肥水条件下,花椹少,枝叶生长快,丰产性高,采叶、伐条、剪梢、整枝及病虫害防治方便。这样的桑树树型属于低干桑()。...
Sunday, April 21, 2024
桑树休眠后,用锯或桑剪除去桑树的死拳、枯桩、病虫枝与细小的无效枝,称为整枝修拳。...
Thursday, April 11, 2024
中耕可以改变土壤理化性状等,桑园一般进行()A、秋耕B、冬耕C、春耕D、夏耕...
Tuesday, March 5, 2024
优良杂交桑苗在栽前需深耕整地,施足基肥,按1.2m×0.4m的规格栽植。...
Thursday, April 11, 2024
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Thursday, April 11, 2024
播种后经过3—4个月的管理,一般苗高60cm,苗茎径3mm以上时,可根据需要有计划起移栽。...
Sunday, April 21, 2024
Thursday, November 23, 2023
下列桑园条件,适宜采用无干或低干树型的有()A、建成密植桑园B、地下水位较高或土层较浅的C、多风或湿热地区D、花果较多的品种...
Tuesday, August 8, 2023
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桑园关门虫是指越冬代的桑园害虫,如常见害虫桑红蜘蛛、桑蓟马,偶发害虫桑尺蠖、野蚕、桑毛虫等。...
Tuesday, March 5, 2024
桑树虫害化学防治分为()防治。A、幼龄期B、蚕期C、成年期D、非蚕期...
Friday, January 26, 2024
下列植物病虫害防治方法中()是物理机械防治法。A、轮作换茬B、以虫治虫C、合理密植D、灯光诱杀...
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Friday, January 5, 2024