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1、缺氮:红苕因土壤中缺氮或底肥、提苗肥氮素不足,地上部茎、叶生长缓慢,茎细叶小,分枝和绿叶数减少,造成光合生产率显著下降,苕块细小产量低。补救措施:亩施猪粪水1500公斤、尿素6公斤淋窝;在后期看苗施肥,差的可亩用尿素0.5公斤,兑水50公斤喷叶面2次。 2、缺磷:红苕缺磷突出表现为幼根幼芽生长较慢,叶片细小呈暗绿色,藤蔓短小,基部叶片黄色斑点多,后期缺磷时叶片呈紫色,随后脱落。中期亩施速效过磷酸钙15公斤,后期亩用磷酸二氢钾150克,兑水60公斤,连续喷雾2次。 3、缺钾:缺钾使茎节和叶柄变短,叶片狭长细小,靠近生长点的叶片呈灰白色,且叶面皱
1, Nitrogen deficiency: Red Cotyledons due to lack of nitrogen or base fertilizer in soil, raising seedlings of nitrogen deficiency, aboveground stems and leaves slow growth, small stems and leaves, branches and green leaf number decreased, resulting in a significant decline in photosynthetic productivity, Low Yield. Remedial measures: 1500 kg of pigs manure Mushi, 6 kg of urea spray litter; seedlings see fertilizer in the latter part of the poor can be mu with 0.5 kg of urea, spray water 50 kg 2 times. 2. Phosphorus deficiency: Phosphorus deficiency in red yeast rice is characterized by slow growth of young shoots, dark green leaves, small short vines, yellow spots on the base leaves, and purple leaves on later phosphorus deficiency. Mushu mid-term super-calcium superphosphate 15 kg, the latter with potassium dihydrogen phosphate 150 grams, watered 60 kg, spray 2 times in a row. 3, potassium deficiency: potassium deficiency so that the stem nodes and petiole becomes shorter, narrow and narrow leaves, leaves near the growing point was gray, and foliage wrinkles