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United States Department of Agriculture (USDA) 2011


Nutrient Pecans

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)


Identification : ARZT-1365550-H21-145

Pays : Etats Unis

Durée : Oct 1, 2011 à Sep 30, 2014

Mots clés : pecan ; carya illinoensis ; zinc ; fertigation ; alternate bearing ; hedging ; mycorrhizae


Supplying adequate zinc nutrition for pecans is critical both to produce maximum tree growth, nut yield, and nut quality. We have tested several approaches, and achieved some limited success. To build upon our previous research, we will 1) continue to study methods of soil applying zinc, including broadcast application of ZnSO4 with and without animal manure, ZnEDTA applied at planting, and ZnEDTA fertigation. Secondly, studies will be conducted to evaluate effects of tree hedging and topping on nutrient utilization, reduction of alternate bearing, and nut quality will be investigated.

We have been conducting a study of annual applications of combinations of ZnSO4 and animal manure in a randomized complete block with four replications. Leaf Zn, and nut yield are monitored to evaluate long-term efficacy. In a newly-planted pecan orchard, Zn-EDTA were applied at planting in a randomized complete block design with four replications. Zn leaf concentration and tree growth are being measured. Two rates of ZnEDTA are being applied through microsprinkler irrigation in a randomized complete block design with four replications. Tree growth is monitored by measuring trunk diameter and shoot growth. Zinc uptake is monitored by collecting leaf tissue several times and Zn deficiency symptoms will be measured by visually observation. A shade-house study is being conducted on potted pecan trees that receive foliar ZnSO4 or soil-applied ZnEDTA. At the end of one growing season, trees will be separated into leaf, stem, and root tissues, each of which will be analyzed for Zn content. Soil in half the pots will be treated with Glyphosate. Zn mobility and interactions between zinc and glyphosate will be evaluated. To evaluate effects of pruning on nut production, quality, nutrient uptake, and alternate bearing, two varieties, Western Schley and Wichita, will be monitored in a commercial pecan orchard. Trees are being hedged and topped on a four year rotation. Nut yield and quality, and leaf nutrient levels, will be monitored annually on trees hedged and topped in the previous dormant season, two years ago, three years ago, and four years ago. Ability of these varieties to recover from pruning will be determined, as will the effect of pruning on alternate bearing

Présentation : USDA

Page publiée le 21 novembre 2015, mise à jour le 11 novembre 2017