This method can promote thecotton seedling development,make the buds and flowers appear earlier,advance the whole growth period by 3—7 days and increase bolls rangingfrom 0.34—0.395 per plnat.Consequently an early cropping and a high yieldis produced,and the amount of increased yields is up to 12.7—34.7%.
Three-year experiments showed compared with natural maturation artificaial maturation treatment could advanced growth period by 5-leaf time, as a result yield increased by 4 725kg/hm2 and pure income increased by 5538 yuan/hm2. Compared with none-treated land, this technology could advance growth Period by 2-leaf time, increase yield by 1773kg/hm2 and pare income by 1156.5yuan/hm2, so it is worth extending.
50kg /667m 2 Carbonizated Shells adding1000kg organic fertilizer as bottom fertilizer cooperate diamine10kg /667m 2 and carbamide7.5kg can make returning green stage and tillering stage advance one day,can improve the resistance power of diseases,insect and lodging and can increase yield16.7%.
The combination Yanyou 422 performed obviously in the hybrid medium keng region test in Jiangsu provine in 2001,and is put into production in advance in 2002.
The result showed that when the concentration was under 300 mg/kg, zinc application was favorable to the growth of rice. Rice plant height increased by 2.4 - 6.9 cm, the number of leaves and tillers increased by 1.7 - 9.7 and 17.6 -48.3 respectively, and the mature period was 5 days in advance.
In particular, when the new shape parameter of the distribution under progressive stress is given (or estimated in advance), the closed forms of these estimators are relatively simple and are numerically accessible on computers.
An analysis of the components of variations and the estimation of four genetic para-meters,namely heritability,genetic correlation,genetic advance and selection index,in F_2population and F_3 progenies of six crosses between varieties of different ecolog cal type ofkeng rice,were made at the Institute Farm,Peking in 1962-1963.1.The heritabilities of important economic characters of rice as estimated from 4 differentmethods (heritability in the broad sense,regression of offsprings on parents,correlatio...
Since 1973, reciprocal crosses of 21 combinations between 26-genomes (Gossypium Jiirsutum, G. barbadense) and 13-genomes (G. arboreum; G. herbaceum) were tested to overcome the low seed set of interspecific hybrids and the sterility of F1 plants. The results of the experiments are as follows:(1) The aqueous solutions of GA 50 ppm and NAA 40-320 ppm were alternatively sprayed on the hybrid bolls at the very beginning of the crosses once per day, and 5 times for each was appropriate. The boll set reached more...
The objectives of this paper are to study the genetic variability of seventeen quantitative characters including growth period, yield and mechanical harvesting of local soybean varieties in lower Yangtze and Huai valleys. The estimates of genotypic variance, genotypic coefficient of variation, heritability and expected genetic advance of these characters were calculated, in which the potentials and expected effects of selection from the natural population of these varieties were clearly indicated. Fro...