Hello,

what is the N/P/K ratio evolution in year?

I have some problems on C. sinensis `Sanguinelli´. It didn't grow to the normal size. I thing that is a fertilization or watering problem. Any ideas?

Thank for your answers.

David

I'm not sure what you mean by "evolution in year", but for a container grown citrus tree the ideal NPK fertilizer ratio is 5-1-3. If you mean the amount of fertilizer to apply to a small container grown tree to achieve good growth I would recommend fertilizing at 300 parts per million (PPM) nitrogen. The Citrus Clonal Protection Program (CCPP) at the University of California (UCR) feed all their non producing container citrus trees at 300 PPM with every watering. I have followed the UCR program for several years with excellent results. With proper heat, light, nutrition, and a properly sized container with space for root growth, your tree can achieve 5 growth flushes per year. - Millet (1,152-)

Hello,

Thak for your answer

Millet wrote:

I'm not sure what you mean by "evolution in year"

By "evolution" I mean differences between spring-, summer- and autumn ratio.

David

It all depend on the environment given the tree throughout the four seasons. If during the late fall, and winter months you do not provide the tree with a long day light period, higher air and root zone temperatures 70F+ (21C+), then you reduce the amount of fertilization. However, if you wish to achieve optimum growth by providing warm season conditions throughout the year, then you fertilize throughout the year. All my citrus are in the greenhouse with winter temperatures of 80 to 90F (25 - 32C) day, and 55 to 60F night (13 to 15C), therefore I fertilize year around. - Millet (1,152-)

I live in Colorado, which is the highest altitude state in the USA. My greenhouse is at an elevation of 5,448 feet, therefore due to the thin air the sun at this altitude the sun light is very strong. Further, just being in a greenhouse, provides plenty of light. The main drawback is the high cost of heating. It normally cost approximately $4,000.00 US per year to heat, but the tree's winter growth is excellent.- Millet (1,152-)