Abstract:

To solve prominent problems of simplified application of organic fertilizers in flower production in Hongta District, a scientific basis for soil fertility cultivation with organic fertilizers was studied by analyzing the relationship between organic matter and other nutrient factors. 50 representative soil samples were collected from 7 major flower growing areas, and 13 indicators such as soil organic matter, total nitrogen and alkaline nitrogen were measured and analyzed. The conclusions are as follows. (1) The organic matter content of soil in the cultivated layer of flowers ranged from 5.9 to 49.7 g/kg, with an average of 29.53 g/kg and a 95% confidence zone of 26.59-32.47 g/kg; and the variation range, average value and 95% confidence zone of the other 12 nutrient indicators were also determined. (2) Soil samples with organic matter content ranged from 30.1 to 49.7 g/kg (with an average of 37.90 g/kg) were classified into organic matter rich or relatively rich levels, accounting for 48% of the total samples, and areas represented by these samples were suitable for flower cultivation in Hongta; soil samples with organic matter content ranged from 5.9 to 29.8 g/kg (with an average of 21.80 g/kg) belonged to medium to very poor levels, accounting for 52% of the total, and areas represented by these samples were the crucial part of soil fertility cultivation with organic fertilizers. (3) The organic matter content of soil had positive correlations with pH, total nitrogen, available phosphorus, available zinc, slow-release potassium, exchangeable magnesium, available iron, and exchangeable calcium, a total of eight indicators, and all the correlations reached a significant level or more; through regression analysis, the regression equation y=a+bx was obtained, and the equation by ANOVA reached a significant level or more; the regression coefficient by t-test P value was less than 0.05, indicating that the organic matter content had significant impact on the eight nutrient indicators. Therefore, in flower production in Hongta District, applying more organic fertilizers could increase the soil organic matter content, as well as the content of total nitrogen, available phosphorus, available zinc, slow-release potassium, exchangeable magnesium, available iron and exchangeable calcium. 8 regression equations could be used to quickly obtain the content of total nitrogen, available phosphorus, available zinc, slow-release potassium, exchangeable magnesium, available iron and exchangeable calcium through the determination of organic matter and pH, thus providing timely guidance to flower fertilization.

Key words: flowers, organic matter, soil nutrients, correlation