The symptoms are also called melasma. It mainly damages leaves, petioles, stems and flower shafts. The leaf spot is present on both sides of the leaf, with a round or near-circular shape and a size of 0.5-8mm. The lesion expands and fuses into a large irregular patch. Petiole, stem, and flower axi ......
Urea is the largest variety of nitrogen fertilizer. Its main advantages and disadvantages are: 1. With high nitrogen content, urea nitrogen content is between 44% and 46%, which is the highest nitrogen fertilizer in solid nitrogen fertilizer. The nitrogen per kilogram of urea is equivalent to 2.4 ......
The sweet potato varieties used in good varieties need not only high yield, good quality, but also early maturing, and it is best to use medium and short vine varieties to facilitate field management and mechanized cultivation. To use detoxified seedlings. Although sweet potatoes are well-tolerat ......
People say that the cultivation of cyanobacteria has "nine deaths and one life". In fact, as long as they grasp their essentials, the reproduction rate is not lower than that of spring and cypress. I have more than 50% of my seedlings in more than three years in the cold cultivation of t ......
PCR (polymerase chain reaction) ã€principle】 PCR (polymerase chain reaction) is used to amplify a small amount of target DNA in vitro for analysis. Reaction system: 1 sample DNA; 2 primer, is a synthetic pair of oligonucleotide strands (about 15-20 nucleotides) for amplification betwee ......
First, the need for fertilizer characteristics (I) Fertilization should not be deep. The roots of shallow peach trees are well developed. There are more lateral and fibrous roots and strong absorption. However, the distribution of roots is shallow, and most of them are concentrated in the soil lay ......
The radish dish is cultivated for about 70 kilograms. About 5,000 kilograms per acre of high-quality cooked farmyard fertilizer, turned into the soil, so that the soil and manure mixed evenly, smashing flat surface, made of a flat width of 1 meter to wait for sowing. Using the dry seed live broa ......
At present, the post-harvest diseases of olive fruits reported at home and abroad are all invasive, mainly caused by pathogenic fungi with latent infestation characteristics, and some are brought into storage during infection in the field. There are: 1. Aspergillus The main disease after fruit h ......
Ornamental pepper is a perennial herb belonging to the genus Capsicum of the Solanaceae family. Because of its low ornamental value, it is often cultivated as a flower or two. Stem stout, much branched, leaves green, flowers white. The fruit is berry, solitary or clustered, erect, slightly sloping ......
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