脲醛缓释肥料棒对橡胶苗生长和养分吸收的影响.

[Objective] The present paper aimed to study the effect of urea-formaldehyde slow-release fertilizer rods on the growth and nutrient absorption of rubber seedlings, and provide a theoretical basis for the application of urea-formaldehyde slow-release fertilizer rods on rubber trees. [Method] Using urea-formaldehyde slow-release fertilizer with 0%,25%, 50%, and 75 % of total nitrogen as the test fertilizer, the pot experiment of rubber tree seedlings was carried out to study the effects of different urea-formaldehyde slow-release fertilizer rods on the growth and nutrient absorption of rubber tree seedlings. [ Result] When the urea-formaldehyde slow-release fertilizer rod with 50% urea-formaldehyde nitrogen was applied, the plant height and stem diameter of the rubber seedlings were the largest, which were 149. 32 cm and 17. 96 mm,respectively. But it was not significantly different from conventional fertilizer treatment. With the increase of the proportion of urea-formaldehyde nitrogen, the whole plant biomass, nitrogen absorption, phosphorus absorption, potassium absorption and fertilizer use efficiency of the rubber tree seedlings all showed as increased first and then decreased. When the urea-formaldehyde slow-release fertilizer rod with 50 % urea-formaldehyde nitrogen was applied, the whole plant biomass, nitrogen absorption, phosphorus absorption,potassium absorption and fertilizer use efficiency of the rubber tree seedlings were the largest. [Conclusion] It is most beneficial to the growth of rubber seedlings and nutrient absorption of rubber tree seedlings when the urea-formaldehyde slow-release fertilizer rod with 50% urea-formaldehyde nitrogen. [ABSTRACT FROM AUTHOR]