All plants need 16 essential food to grow . Three of these are non - minerals that plants get from sunlight and urine : hydrogen , carbon and oxygen . The other 13 are minerals that plants get from the land . Among these , several are all-important for pecans . The good gauge of the nutrient stage for pecan trees is a foliar or leaf analytic thinking . According to the University of Georgia cooperative extension , this psychoanalysis should be done between July 7 and August 7 . After the analysis , you may compare the results and see if they fall within the enough reach .
Nitrogen
Nitrogen ( N ) is essential for pecan trees , especially during early leaf growth and kernel weft . Without it , the Sir Herbert Beerbohm Tree suffers growth deficiencies and poor health . However , too much nitrogen can cause excess foliage , shading and decreased return . The enough chain for nitrogen should be between 2.5 to 3.3 percent .
Phosphorus
Phosphorous ( P ) is used for energy storage and to grow wood and nuts . When insufficient , leaves unremarkably turn a dull green colour or , if the variety is heavy bearing , as a marginal leaf scorch that appear about 7 to 10 day before sucking split up and untimely defoliation . If the phosphoric level is too high , it may inhibit the ingestion of nitrogen , smoothing iron , zinc and cop . The enough range for phosphorous should be between 0.12 to 0.3 percent .
Potassium
Potassium ( K ) helps activate enzymes , move carbohydrates , and regulate osmosis within pecan trees . Potassium level also influence the impedance of pecan trees to winter injury . It is important to balance the levels of potassium and nitrogen since an unbalance can go to a condition call nitrogen scorch . The sufficiency cooking stove for potassium should be between 1.25 to 2.5 percentage .
Magnesium
A magnesium ( Mg ) want is common in pecan trees that are raise on dry , acidic or sandy soil , especially if the soil have a high K grade . Signs of deficiency include a " Christmas tree " pattern on the folio , eff as intervienal chlorosis , accompany by marginal leaf scorch . The sufficiency range for magnesium should be between 0.35 to 0.6 per centum .
Zinc
Zinc ( Zn ) levels impact a pecan trees flowering , fruit size , leaf efficiency , leaf expanding upon , shoot extension , and nut fruit . Signs of a zinc deficiency includes a curling of youthful leaves , a rose window pattern on the folio , minute foliage and terminal die - back . The sufficiency range for zinc should be between 50 to 100 ppm .
Iron
Iron ( Fe ) is necessary during photosynthesis . Deficiencies are usually get by cold , wet springs , over - liming or a high concentration of atomic number 30 , phosphoric or manganese in the soil . symptom of iron want are very exchangeable to atomic number 7 deficiencies and usually come about early in the growing time of year and is more common in older pecan Sir Herbert Beerbohm Tree . The adequacy image for atomic number 30 should be between 50 to 300 ppm .
Boron
Boron ( B ) helps carbohydrates move across mobile phone walls and stabilize the pollen germ tube . If Deficiencies in pecan trees can reduce fecundation . A pecan tree will receive symptom of boron deficiencies if the foliar point is below 15 ppm . However , the sufficiency orbit for atomic number 5 is between 50 to 100 ppm .
Nickel
Although it is not considered an " essential " nutrient , nickel note ( Ni ) is authoritative for pecans . When wanting , it causes a condition called computer mouse ear . shiner ear make rounded foliage pourboire and reduces the size of moved foliage . These symptom signal that a buildup of carbamide has occurred . Symptoms usually occur when the foliar levels of nickel note is below 3 ppm .
Other Nutrients
The reach for calcium should be between 1.3 to 1.5 percent . Manganese ( Mn ) inadequacy are rare and will only hap if the levels are less than 1 ppm . However , the sufficiency range for manganese should be between 100 to 800 ppm . Copper ( Cu ) aids in source metamorphosis , helps the tree utilize proteins and is essential for reproductive increase . The sufficiency range for copper should be between 6 to 30 ppm .
