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近年来,上高县麻科所扩种苎麻近300亩,炭疽病发生较为普通,一般发病率为20～40％,重的病叶率、病情指数分别达90％和55以上。尤其是茎杆受害后,纤维支数、强力度、断裂长度下降,且纤维布有红褐色斑点,麻色差,等级下降,直接影响经济效益。为有效控制炭疽病的为害,针对当地药源缺泛和红壤地偏酸性(pH5左右)问题,我们在上高麻科所红壤麻地进行了改土防病试验。 一、试验方法 设三个处理,即①亩施石灰75公斤后中耕覆土;②亩施石灰75公斤后不中耕覆土、任其自然;③空白对照。每处理面积0.06亩,重复3次,按病情4级标准记载,于施石灰前、施石灰后15天和30天分别定点调查病情,收获前测试株高,有效株率和收获时测产。
In recent years, Shanggao County Maichu expanded ramie nearly 300 acres, anthrax occurs more common, the general incidence of 20 to 40%, the severity of disease leaf rate, disease index were 90% and 55 or more. Especially when the stalk is damaged, the number of fibers, the strength and the length of the break decrease, and the fiber cloth has reddish-brown spots and the color of the linen is poor, and the grade is declining, which directly affects the economic benefits. In order to effectively control anthracnose damage, aiming at the problem of lack of local drug sources and partial acidity (about pH5) in red soil, First, the test method is set to three treatments, that is ① ① 75 kg of lime acre planted soil cover; ② acres of lime 75 kg of soil does not cultivate, let it be natural; ③ blank control. Each treatment area of 0.06 mu, repeated 3 times, according to the disease grade 4 standard records, before lime application, lime 15 and 30 days after the disease were sentinel survey, pre-harvest test plant height, effective plant yield and harvest measured.