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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Research Unit » Research » Publications at this Location » Publication #156071
Title: SEASONAL DYNAMICS OF MINERAL UPTAKE AND ALLOCATION IN WHOLE PINOT NOIR VINES IN A RED-HILL SOIL OVER 2 YEARS

Author
item Schreiner, Roger - Paul
item BAHAM, JOHN - OREGON STATE UNIVERSITY

Submitted to: Oregon Wine Advisory Board Research Progress Reports
Publication Type: Proceedings
Publication Acceptance Date: 2/1/2003
Publication Date: 3/1/2003
Citation: SEASONAL DYNAMICS OF MINERAL UPTAKE AND ALLOCATION IN WHOLE PINOR NOIR VINES IN A RED-HILL SOIL OVER 2 YEARS. Schreiner, R.P., Baham, J.

Interpretive Summary: A two-year study of nutrient uptake and use in mature Pinot noir vines growing in Jory soil at Woodhall vineyard has shown that the timing of nutrient uptake from soils generally corresponds to the timing of nutrient demand by the developing canopy. Nitrogen uptake was also important in the winter time (between leaf-fall and pruning). The two minerals that vines relied most heavily on stored reserves (N and P), were taken up from soil earlier in the season (peak uptake at bloom) than those minerals that vines were less dependent on stored reserves (K, Ca, and Mg ' peak uptake after bloom). For both years of this study, we found that large woody roots were the most important storage organ for N and P. Fine roots and the trunk were the most important storage organs for K. The nutrient requirements of the canopy to produce a Pinot noir crop of 2.4 tons/acre were as follows: 35 pounds/acre of N & K, 3.5 pounds/acre of P, 22 pounds/acre of Ca, and 10 pounds/acre of Mg. However, since significant stores of N and P were re-allocated to the canopy, much less of these nutrients were actually taken up from soil during the growing season. A crop load of 2.4 tons/acre was better than 1.8 tons/acre on these mature vines because the K was in oversupply at the lower crop load resulting in high juice pH. Our data strongly suggest that K supply in this soil is sufficient, but P supply and B supply are limiting in this Pinot noir vineyard.

Technical Abstract: A two-year study of nutrient uptake and use in mature Pinot noir vines growing in Jory soil at Woodhall vineyard has shown that the timing of nutrient uptake from soils generally corresponds to the timing of nutrient demand by the developing canopy. Nitrogen uptake was also important in the winter time (between leaf-fall and pruning). The two minerals that vines relied most heavily on stored reserves (N and P), were taken up from soil earlier in the season (peak uptake at bloom) than those minerals that vines were less dependent on stored reserves (K, Ca, and Mg ' peak uptake after bloom). For both years of this study, we found that large woody roots were the most important storage organ for N and P. Fine roots and the trunk were the most important storage organs for K. The nutrient requirements of the canopy to produce a Pinot noir crop of 2.4 tons/acre were as follows: 35 pounds/acre of N & K, 3.5 pounds/acre of P, 22 pounds/acre of Ca, and 10 pounds/acre of Mg. However, since significant stores of N and P were re-allocated to the canopy, much less of these nutrients were actually taken up from soil during the growing season. A crop load of 2.4 tons/acre was better than 1.8 tons/acre on these mature vines because the K was in oversupply at the lower crop load resulting in high juice pH. Our data strongly suggest that K supply in this soil is sufficient, but P supply and B supply are limiting in this Pinot noir vineyard.