TRENDS IN LEAF NUTRIENT LEVELS IN COMMERCIAL HIGHBUSH BLUEBERRY PLANTINGS IN MICHIGAN

1989 ◽  
pp. 157-161
Author(s):  
E.J. Hanson
Keyword(s):  
Highbush Blueberry ◽  
Nutrient Levels ◽  
Leaf Nutrient Levels

Nutrient status of sugar cane in relation to leaf nutrient concentration

1968 ◽  
Vol 8 (34) ◽  
pp. 606 ◽  
Author(s):  
ICR Holford
Keyword(s):  
Sugar Cane ◽  
Field Experiments ◽  
Leaf Tissue ◽  
Growth Period ◽  
Nutrient Status ◽  
Maximum Growth ◽  
Nutrient Concentrations ◽  
Ratoon Crop ◽  
Nutrient Levels ◽  
Leaf Nutrient Levels

The nitrogen, phosphorus, and potassium requirements of sugar cane were studied in relation to the concentration of these elements in the leaf tissue of three varieties of sugar cane grown commercially in Fiji. Percentage yields of sugar cane in fertilizer field experiments were highly correlated with leaf nutrient levels in the control plots, provided leaf sampling was carried out during the maximum growth period of mid- January to mid-May. For each nutrient there was a marginal zone of leaf concentration below which crops always gave significant yield responses to applied nutrients and above which crops failed to respond. Marginal zones for crops sampled during mid-March to mid-May were 1.4-2.0 per cent for nitrogen, 0.13-0.21 per cent for phosphorus, and 0.9-1.5 per cent oven dry leaf for potassium. Within the deficient range of leaf nutrient concentrations there was little relationship between optimum rates of fertilizer required to correct the deficiency and leaf nutrient levels of unfertilized cane. Because of the lateness of sampling, any indication of fertilizer requirement would only be applicable to a subsequent ratoon crop.

LEAF NUTRIENT LEVELS OF STRAWBERRIES (CV. TUDLA) IN RELATION TO CROP YIELD

2002 ◽  
pp. 447-450 ◽  
Author(s):  
D. Almaliotis ◽  
D. Velemis ◽  
S. Bladenopoulou ◽  
N. Karapetsas
Keyword(s):  
Crop Yield ◽  
Nutrient Levels ◽  
Leaf Nutrient Levels

Effect of girdling on leaf nutrient levels in pear cultivars Patharnakh and Punjab Beauty

2015 ◽  
Vol 72 (3) ◽  
pp. 319
Author(s):  
Damandeep Singh ◽  
W.S Dhillon ◽  
N.P. Singh ◽  
P.P.S. Gill
Keyword(s):  
Nutrient Levels ◽  
Leaf Nutrient Levels

EFFECT OF ACIDITY ON GROWTH AND NUTRIENT COMPOSITION OF THE HIGHBUSH BLUEBERRY

1971 ◽  
Vol 51 (5) ◽  
pp. 385-390 ◽  
Author(s):  
L. R. TOWNSEND
Keyword(s):  
Nutrient Composition ◽  
Plant Roots ◽  
Highbush Blueberry ◽  
Direct Effects ◽  
Nutrient Levels ◽  
Foliar Nutrient ◽  
Effects Of Ph ◽  
Ph Range

Two highbush blueberry cultivars (Blueray and seedling selection 50-6-9) were grown at various pH levels in water cultures. Within the pH range 3.5 to 6.0, growth of Blueray did not appear to be limited because of the direct effects of pH. At pH 2.5, however, growth was nonexistent and at pH 3.0 it was restricted. Growth of 50-6-9 was significantly greater at pH 4.0 and 5.0 than at pH 3.0 or 6.0. Plant roots became progressively darker with increasing pH above 4.0 to 4.5. In general, root nutrient levels, Ca excepted, were higher than foliar nutrient levels, although root and foliar Mg levels were not very different except at pH 3.0. Root Mn at pH 5.0 and 6.0 was 10 to 20 times greater than at pH 3.0 or 4.0.

scholarly journals EVALUATION OF FERTILITY PRACTICES FOR VIDALIA ONIONS

HortScience ◽  
2005 ◽  
Vol 40 (3) ◽  
pp. 885e-886
Author(s):  
George E. Boyhan ◽  
Reid L. Torrance ◽  
Ronald H. Blackley ◽  
M. Jefferson Cook ◽  
C. Randell Hill
Keyword(s):  
Total Yield ◽  
Calcium Nitrate ◽  
Leaf Tissue ◽  
Potassium Fertilizer ◽  
Nutrient Levels ◽  
One Year ◽  
Nitrogen Rates ◽  
Fertilizer Rates ◽  
Tissue Nitrogen ◽  
Leaf Nutrient Levels

Fertilizer rates of N, P, K were evaluated over 4 years (2000–03) as were different sources of experimental and commercial fertilizers. The highest total yields and yields of jumbos (≥7.6 cm) occurred with nitrogen rates of 140–168 kg·ha–1. Neither phosphorus nor potassium rates had an affect on total yield. Phosphorus rates of 0-147 kg·ha–1 and potassium rates of 0–177 kg·ha–1 were evaluated. Increasing nitrogen fertilizer resulted in increasing leaf tissue nitrogen, but did not affect P, K, Ca, or S. Increasing phosphorus fertilizer increased leaf tissue phosphorus only slightly (p = 0.060) with no affect on other leaf nutrient levels. Increasing potassium fertilizer did affect leaf tissue potassium 2 out of 4 years with none of the other leaf nutrient levels affected. Several fertilizers were also evaluated including an experimental fortified peat (10%N), calcium nitrate, ammonium nitrate, diammonium phosphate, 5–10–15 (56 kg·ha–1 N), 18-6-8 liquid, 14–0–12 8%S liquid, 19–8–19 slow-release at rates of 140 and 168 kg·ha–1 nitrogen. All were used to supply 168 kg·ha–1 nitrogen unless noted otherwise. P and K were supplied according to soil test recommendations unless they were part of the fertilizer formulation. There were no differences between the different fertilizer sources for total yield and differences in jumbo yields only occurred one year out of three years of testing and for medium (≥5.1 and <7.6 cm) yields there were differences two years out of three years of testing.

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