The size of it and timbre of pecans are determined by the number of leaf for each en . A medium - sized pecan tree requires about 10 chemical compound leave , each containing nine to 13 leaflets ; large ball ask more leaves . Strong crop of large nuts require prolific ground in purchase order for trees to yield the necessary foliage . Pecan Tree like a soil pH of 6 to 6.5 . To easily ascertain the fertiliser needs of pecan tree diagram , the territory should be sampled by an agrarian extension service of process .

Soil and Foliage Testing

dirt samples should be taken from the open to 8 inch deep and from 8 to 16 inches deep . In mid- to later July , a sample of at least 100 undamaged leaflets should be take from the center of chemical compound leaves growing in full sun . The cusp should be placed in an exposed paper bag and allowed to dry out . They should not be collected after applications of nutrients or pesticide .

Nitrogen

Ammonium sulfate is a urge seed of nitrogen because it decreases the soil pH , temporarily increase the Zn , branding iron and magnesium available to pecan trees . Nitrogen plant food are converted to water - soluble nitrate that are easy leach from the soil , so they should be applied in several applications programme . The fertiliser should never be enforce within 12 in of the luggage compartment .

Nitrogen on Young Trees

Beginning with the second year of growth , agronomist at New Mexico State University commend applying ¼ to ½ lb . of ammonium sulphate to one tree every six weeks until June . If the Sir Herbert Beerbohm Tree grows slow , the nitrogen should be reduced to 1/3 pound . A untried tree fertilise after June will retain its leaf too long in the gloam , run a risk winter injury . From the third year until the tree bear pecans , 2 lbs . are use twice a year . Another rule is go for ¼ pound . of nitrogen per inch of the trunk diameter appraise 3 feet above the terra firma .

Nitrogen on Mature Trees

The terminal branches of Tree bearing pecan tree should grow 6 to 12 column inch a twelvemonth . Pecan trees bear nuts in alternating years . For trees bear nuts , agronomists at North Carolina State University recommend lend oneself 4 lbs . of 10 - 10 - 10 fertiliser in February or former March for each inch of the diameter of the trunk measure below the scaffold ramification . For tree not wear nut , 1 lb . of 10 - 10 - 10 fertilizer for each class of the tree diagram ’s years should be employ in late February or early March .

If soil is not tested , agronomist at the University of Georgia recommend a mid- to later March coating of up to 8 lbs . of ammonium nitrate at the charge per unit of 1 lb . per inch of trunk diam .

Zinc

If a grease analysis show a deficiency of atomic number 30 , zinc sulphate is best utilise as a foliar spray . Zn chelate compound release zinc lento so that the tooth root can absorb it before it gets splice up in the soil . Tree should be sprayed four metre , once a week beginning when the leaves first unfold . After that young trees should be sprayed every two week until the end of July .

New Mexico State agronomists urge 2 to 3 lb . of 36 percent zinc sulfate per 100 congius of water plus 1 ½ quarts of carbamide that is 32 percent liquid nitrogen . The atomic number 7 helps the leaves plunge the atomic number 30 . The spray should be applied from the ground , aimed at the bottoms of the leaves .

Other Minerals

If grease exam disclose a deficiency of phosphorus , New Mexico State agronomists advocate that an 18 - 48 - 0 ace phosphate be incorporated before pecan trees are plant . If yellowing leaves indicate an iron deficiency , iron sulphate can be sprayed together with zinc sulphate .

References

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