RELIABILITY OF PETIOLE SAP TEST FOR N NUTRITIONAL STATUS ASSESSING IN PROCESSING TOMATO

A procedure for rapid determination of nitrate in the fresh petiole sap using an ion specific electrode was developed. A highly significant correlation (R2-0.92) was obtained between the nitrate measured by the sap test and the conventional oven-dried tissue method. The effects of five nitrogen(N) rates ranging from 0 to 268 kg ha-1, and five dates of sampling dates beginning at tuber initiation, on the sap nitrate concentration were investigated. The nitrate level increased in proportion to N fertilizer rate. The nitrate level was generally higher at tuber initiation and decreased as the season progressed. The rate of decrease was related to the N supply in the soil. At N rates of 0 and 67 Kg ha-1, the average weekly decrease in the nitrate level was greater than 100 ppm. Based on yield response, the nitrate levels were partitioned as deficient adequate and excessive, and a critical nutrient range was established. The sap test offers a tactical approach for corrective in-season fertilization and a means to increase the efficiency of both fertilizer and available soil N.

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A Petiole Sap Nitrate Test for Cauliflower

HortScience ◽

10.21273/hortsci.31.6.934 ◽

1996 ◽

Vol 31 (6) ◽

pp. 934-937 ◽

Cited By ~ 16

Author(s):

Aki Kubota ◽

Thomas L. Thompson ◽

Thomas A. Doerge ◽

Ronald E. Godin

Keyword(s):

Application Rate ◽

Nitrate Ion ◽

Growing Seasons ◽

Water Rates ◽

Nitrate Determination ◽

N Rates ◽

The Relationship ◽

Crop Maturity ◽

Petiole Sap ◽

Sap Test

This study was conducted to evaluate the accuracy of sap analysis using a portable nitrate ion meter for cauliflower (Brassica oleracea L. Botrytis Group, cv. Candid Charm) petiole nitrate determination. The relationship between NO3-N concentration in fresh petiole sap and in dried petiole tissue was studied for cauliflower grown in southern Arizona during the 1993–94 and 1994–95 growing seasons. Experiments were factorial combinations of three water rates and four N rates, both ranging from deficient to excessive. Petioles were collected throughout each season and were split for analysis of sap NO3-N and dried petiole NO3-N. Linear correlations between the two methods were similar in both seasons, with no consistent effect due to water application rate or crop maturity. Therefore, a single regression equation was derived: petiole sap NO3-N (mg·liter–1) = 0.047 × dry petiole NO3-N (mg·kg–1) + 218 (r2 = 0.772). This equation can be used to relate sap test measurements to existing guidelines for NO3-N concentrations in cauliflower petioles. These results suggest that the quick sap test, using the portable nitrate ion meter, is a valuable technique for monitoring N status of cauliflower.

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EFFECT OF WASHING AND CUTTING ON NO3-N AND K SAP CONCENTRATIONS ON VEGETABLE PETIOLES

HortScience ◽

10.21273/hortsci.41.3.508c ◽

2006 ◽

Vol 41 (3) ◽

pp. 508C-508

Author(s):

David Studstill ◽

Michela Farneselli ◽

Eric Simonne ◽

Bob Hochmuth

Keyword(s):

Nutritional Status ◽

Control Method ◽

Average Concentration ◽

Bell Pepper ◽

Distilled Water ◽

Vegetable Crops ◽

Limited Information ◽

Simple Method ◽

Petiole Sap

Petiole sap testing using ion-specific electrodes is a simple method that can be used to guide in-season applications of N and K to vegetable crops. This method requires petiole sampling and sap extraction using a sap press. Because some vegetables are grown with foliar applications of N and/or K and because some crops have large petioles, petioles may need to be washed and/or cut before being pressed. Because limited information is available on the effect of washing/cutting on sap testing results, muskmelon, bell pepper and tomato petioles were used to test if washing/cutting reduced NO3-N and K concentrations and changed the subsequent interpretation of plant nutritional status. Washing for 30, 60, or 120 seconds in distilled water and cutting petioles before or after washing significantly reduced sap concentrations (p = 0.01 and p = 0.04 for NO3-N and K, respectively) in 7 of 12 tests when compared to the control method (petioles cut and not washed). The average concentration reductions between the control and the lowest value among all the washing/cutting treatments were 30% for NO3-N and 19% for K. These losses due to washing/cutting are likely to change the diagnosis of nutritional status from “sufficient” to “less than sufficient” and therefore may suggest the need for unnecessary fertilizer applications.

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VALIDATION OF N NUTRITIONAL STATUS TOOLS FOR PROCESSING TOMATO

Acta Horticulturae ◽

10.17660/actahortic.2010.852.27 ◽

2010 ◽

pp. 227-232 ◽

Cited By ~ 15

Author(s):

M. Farneselli ◽

P. Benincasa ◽

F. Tei

Keyword(s):

Nutritional Status ◽

Processing Tomato

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Petiole Sap Testing Sampling Procedures For Monitoring Pumpkin Nutritional Status

Communications in Soil Science and Plant Analysis ◽

10.1081/css-120024069 ◽

2003 ◽

Vol 34 (15-16) ◽

pp. 2355-2362 ◽

Cited By ~ 6

Author(s):

David W. Studstill ◽

Eric H. Simonne ◽

Chad M. Hutchinson ◽

Robert C. Hochmuth ◽

Michael D. Dukes ◽

...

Keyword(s):

Nutritional Status ◽

Sampling Procedures ◽

Petiole Sap

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Nutritional status as a prognostic factor in advanced head and neck cancer

Clinical Otolaryngology ◽

10.1046/j.1365-2273.1998.0165g.x ◽

1998 ◽

Vol 23 (4) ◽

pp. 376-376

Author(s):

Quak ◽

Van Bokhorst ◽

Klop ◽

Van Leeuwen ◽

Snow

Keyword(s):

Head And Neck Cancer ◽

Prognostic Factor ◽

Nutritional Status ◽

Head And Neck ◽

Neck Cancer ◽

Advanced Head

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Zinc Depletion Increases Readmission in Older Patients: An Example of Interactions Between Nutrition and Disease

International Journal for Vitamin and Nutrition Research ◽

10.1024/0300-9831/a000275 ◽

2017 ◽

Vol 87 (1-2) ◽

pp. 10-16 ◽

Cited By ~ 1

Author(s):

Salah Gariballa ◽

Awad Alessa

Keyword(s):

Nutritional Status ◽

Inductively Coupled Plasma ◽

Older Patients ◽

Controlled Trial ◽

Prognostic Indicators ◽

Hospitalised Patients ◽

Increased Risk ◽

Co Morbidity ◽

The Impact ◽

Poor Nutrition

Abstract. Background: ill health may lead to poor nutrition and poor nutrition to ill health, so identifying priorities for management still remains a challenge. The aim of this report is to present data on the impact of plasma zinc (Zn) depletion on important health outcomes after adjusting for other poor prognostic indicators in hospitalised patients. Methods: Hospitalised acutely ill older patients who were part of a large randomised controlled trial had their nutritional status assessed using anthropometric, hematological and biochemical data. Plasma Zn concentrations were measured at baseline, 6 weeks and at 6 months using inductively- coupled plasma spectroscopy method. Other clinical outcome measures of health were also measured. Results: A total of 345 patients assessed at baseline, 133 at 6 weeks and 163 at 6 months. At baseline 254 (74%) patients had a plasma Zn concentration below 10.71 μmol/L indicating biochemical depletion. The figures at 6 weeks and 6 months were 86 (65%) and 114 (70%) patients respectively. After adjusting for age, co-morbidity, nutritional status and tissue inflammation measured using CRP, only muscle mass and serum albumin showed significant and independent effects on plasma Zn concentrations. The risk of non-elective readmission in the 6-months follow up period was significantly lower in patients with normal Zn concentrations compared with those diagnosed with Zn depletion (adjusted hazard ratio 0.62 (95% CI: 0.38 to 0.99), p = 0.047. Conclusions: Zn depletion is common and associated with increased risk of readmission in acutely-ill older patients, however, the influence of underlying comorbidity on these results can not excluded.

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