Study On Optimal Fertilizer Of Strong Citrus Fruit Potash For Shimian Huangguogan

This article was conducted on the strong fruit potassium fertilizer of the Huangguogan, which was set eight horizontal gradients with0.25kg(0.055kgK2O),0.50kg(0.11kgK2O),0.75kg(0.165kgK2O),1.00kg(0.22kgK2O),1.25kg(0.275kgK2O),1.50kg(0.33kgK2O),1.75kg(0.385kgK2O) and2.00kg(0.44kgK2O) for each tree in the early fruit rapid-expansion stage, and came from potassium magnesium. After collecting the soil and leaves samples monthly from the following month when the fertilization treatments had been applied to the harvest month, a lots of experiments were done, such as the balance between soil potassium and leaves potassium fertilizer levels was examined and the fruit quality of the harvestable Huangguogan was analysed. And in order to improve the flavor of the Huangguogan that was a very late-maturing fruit, the optimum fertilization amount of the strong fruit potassium fertilizer was confirmed. Besides, for the sake of references to the Huangguogan and other latte-maturing citrus varieties, the law of potassium from soil and absorption potassium in leaves was explored during the period from expanding to maturity. The creative point in this independent experiment was that the level gradients between the strong fruit potassium fertilizer for the Huangguogan were much concentrated, and the sampling time was compacted, which provided a possible way to study the potash demand and soil-leaf potassium changes exactly during the period from expanding to maturity.The results were as follows.1. T6ie, potassium magnesium fertilizer1.5kg(0.22kgK2O) soil short-term K supply (available potassium) fertilizer-and long-term K supply (slowly available potassium) best,Both to meet the9November Huangguogan continuous absorption of potassium, but also ensure the supply of potassium in November,And in this fertilization level will not be too serious loss of potassium fertilizer,the greatest degree of savings to fully meet the Huangguogan fruit enlargement and maturity of each period to be potassium fertilizer to reduce leaching losses.2. In all fertilization treatments, leaf potassium continued to increase from September to November, arrived in November potassium maximum in December to February, leaf potassium gradually decreased until February to minimize the leaf-like branches and leaves for the resultsfilms, this conclusion also may reflect the fruits need potassium law of continuing need potassium for fruit from September to November, and need potassium highest peak in November, December to pick before the potassium content decreased gradually until the February demandto a minimum, according to this law to establish a more scientific and sophisticated strong fruit potassium fertilizer fertilizer; leaves potassium in the treatment of various potassium contents were significantly above the control, and fertilization level T6potassium magnesium1.51eaf potassium content kg (0.22kgK.2O) in each period at the maximum, the most abundant potassium supply of fertilizer, because of excessive absorption of potassium anti-leaf potassium content lower.3. In T6that is, potassium and magnesium sulfate when fertilizer1.5kg (0.22kgK2O), the combined effect of fruit quality indicators the highest total sugar content8.19g/100ml total acid content of1.00g/100ml, sugar to acid ratio of8.19, Vc content of39.3lmg/100ml, where Vc content and total sugar content is not the highest, but ultimately in the index-sugar acid ratio is the highest, reaching the most important purpose of this test-to improve the flavor of the Huangguogan fruit.4. Comprehensive analysis of soil potassium, leaf potassium and fruit quality can be drawn:the application rate of the Huangguogan strong fruit potassium fertilizer for potassium magnesium1.5kg (0.22kgK2O).