Petiole sap nitrate concentration to assess crop nitrogen status of greenhouse sweet pepper

2021 ◽  
Vol 285 ◽  
pp. 110157
Author(s):  
Alejandra Rodríguez ◽  
M. Teresa Peña-Fleitas ◽  
Francisco M. Padilla ◽  
Marisa Gallardo ◽  
Rodney B. Thompson
Keyword(s):  
Nitrate Concentration ◽  
Sweet Pepper ◽  
Nitrogen Status ◽  
Petiole Sap

scholarly journals COMPARISON OF IN-FIELD TECHNIQUES FOR MONITORING PLANT AND SOIL NITROGEN STATUS

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 571b-571 ◽  
Author(s):  
T.K. Hartz ◽  
R.F. Smith ◽  
W.L. Schrader
Keyword(s):  
Soil Solution ◽  
Nitrogen Nutrition ◽  
Nitrate Concentration ◽  
Nitrate Content ◽  
Nitrogen Status ◽  
Leaf Reflectance ◽  
Nitrogen Levels ◽  
Highly Correlated ◽  
Petiole Sap ◽  
Irrigated Soils

California vegetable growers are adopting drip irrigation at an accelerating pace, which affords the opportunity for more exacting control of nitrogen nutrition. Consequently, the need for quick, accurate, grower-friendly techniques for monitoring nitrogen status in soil and plant material has increased. Three field monitoring techniques were examined in detail: the analysis of soil water samples drawn by soil solution access tubes (SSAT). leaf reflectance as measured by the Minolta SPAD 502 chlorophyll meter, and petiole sap analysis with a Horiba portable nitrate-selective electrode meter. Nitrate concentration in soil solution was highly stratified in drip-irrigated soils, both with regard to location in the field and position with respect to the drip line, making the use of SSAT technology impractical as a tool for routine N fertigation scheduling. Correlation of SSAT nitrate values to any measure of plant N status was poor. Similarly, leaf reflectance correlated poorly with any measure of tissue N in the crops examined. Nitrate content of petiole sap was highly correlated with conventional laboratory analysis of dry petiole tissue over a range of crops and nitrogen levels.

Yield and fruit quality response of sweet pepper to organic and mineral fertilization

2007 ◽  
Vol 22 (3) ◽  
pp. 233-238 ◽  
Author(s):  
F.M. del Amor
Keyword(s):  
Organic Farming ◽  
Fruit Quality ◽  
Nitrate Concentration ◽  
Sweet Pepper ◽  
Quality Parameters ◽  
Soluble Solids ◽  
Fresh Weight ◽  
Mineral Fertilization ◽  
Marketable Yield ◽  
Crop Cycle

AbstractSweet pepper plants were grown in a greenhouse under three different cultivation methods (organic, integrated and conventional farming). During the crop cycle, plant growth and especially yield and fruit quality parameters were monitored to determine the effects of the different fertilization strategies. Plant fresh weight and total leaf fresh weight were progressively reduced, relative to the other treatments, in the organic treatment compared with the conventional, and at the end of the crop cycle these parameters were reduced by 32.6 and 35% respectively. This reduction in growth was directly correlated with plant nitrate concentration and, at the end of the study, nitrate concentration was reduced almost completely in the organic treatment. Despite the important effect on growth, no significant differences in total marketable yield were observed between conventional and organic farming, although integrated farming showed the highest yield in the extra and first class fruit categories. Organic farming increased antioxidant activity but reduced both chlorophylls and β-carotene. Fruit firmness, pericarp thickness, pH and total soluble solids content showed higher values with the organic method, but these differences were not significant with respect to the conventional method. Our results show the advantages of the organic fertilization, from both environmental and economic perspectives, if proper dosage is added to the crop and the demonstrated buffer capacity of these plants, with respect to maintaining yield under nutrient depletion at later stages of development, is taken into account.

Direct measurement of petiole sap nitrate in potato to determine crop nitrogen status

1993 ◽  
Vol 16 (3) ◽  
pp. 515-521 ◽  
Author(s):  
M. P. Westcott ◽  
C. J. Rosen ◽  
W. P. Inskeep
Keyword(s):  
Direct Measurement ◽  
Nitrogen Status ◽  
Petiole Sap

Petiole sap nitrate is better than total nitrogen in dried leaf for indicating nitrogen status and yield responsiveness of capsicum in subtropical Australia

1994 ◽  
Vol 34 (6) ◽  
pp. 835 ◽  
Author(s):  
JK Olsen ◽  
DJ Lyons
Keyword(s):  
Total Nitrogen ◽  
Nitrate Concentration ◽  
Fruit Yield ◽  
Yield Response ◽  
Total N ◽  
N Concentration ◽  
Marketable Fruit ◽  
Petiole Sap ◽  
N Status ◽  
Subtropical Australia

This study was conducted to assess the usefulness of petiole sap nitrate and total nitrogen (N) in dried leaf for determining N status and yield response in capsicum (Capsicum annuum L.) grown with plastic mulch and trickle irrigation in subtropical Australia. Five rates of N (0, 70, 140,210, 280 kg/ha) were applied in factorial combination with 2 rates of potassium (K: 0, 200 kg/ha) in randomised block experiments to capsicum cv. Bell Tower grown at Bundaberg Research Station in spring 1990 and autumn 1991. Critical nutrient ranges for nitrate concentration in petiole sap and for total N concentration in dried youngest mature leaf blades plus petioles (YMB + P) were derived at different stages of crop development (bud development, BD; first anthesis, FA; 80% flowering, F; fruit set, FS). Sap nitrate was about 5 times more sensitive to changes in N application than total N. Petiole sap nitrate accounted for a greater amount of the variation in marketable fruit yield (quadratic square root relationships, 0.45 < R2 < 0.83) than total N concentration in dried YMB + P (linear relationships, 0.29 < R2 < 0.74). Simple linear regressions indicated a stronger relationship between applied N and petiole sap nitrate concentration than total N concentration in dried YMB + P (range in R2 values among 8 sampling events: 0.71-0.91 for petiole sap nitrate, 0.35-0.78 for YMB + P total N). For the fertiliser application strategy, 60% of N was applied pre-fruitset and 40% after. Sap nitrate concentrations associated with 95 and 100% of maximum marketable fruit yield increased from BD (5010-6000 mg/L spring, 4980-5280 mg/L autumn) to FA (6220-7065 mg/L spring, 555M000 mg/L autumn). After FA, the range progressively decreased to 1640-2800 and 520-1220 mg/L at FS, for spring and autumn, respectively. It was concluded that petiole sap nitrate was a better indicator of plant N status and yield response than total N concentration in dried YMB + P for capsicum in subtropical Australia. A critical petiole sap K concentration (corresponding with maximum yield and at which no yield response to K addition was measured) of >4800 mg/L was proposed by correlating sap K with yield responses.

scholarly journals Comparison of Specific Electrode Techniques for Measuring Bell Pepper Petiole Sap Nitrate Concentration

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 759E-759 ◽  
Author(s):  
H.G. Taber ◽  
D.F. Cox ◽  
B.C. Smith ◽  
K.A. Klock
Keyword(s):  
Standard Deviation ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Reduction Method ◽  
Nitrate Concentration ◽  
Bell Pepper ◽  
Ion Selective Electrodes ◽  
Quick Test ◽  
The Difference ◽  
Petiole Sap

Sap nitrate was determined with the ion-selective electrodes, HACH combination nitrate electrode, and the CARDY nitrate meter on pepper petioles over five sample dates (n = 160). The electrode values were compared to the Cd reduction method performed on a Lachat automated ion analyzer with flow injection analysis. Thirty petioles were collected from plots of each of several N rate studies and the sap expressed by a hand-held garlic press. Correlation among the techniques were similar (r > 0.9), but the CARDY meter constantly read 100 to 175 ppm higher than the HACH. Across all dates the standard deviation of the difference, compared with the Cd reduction, for the HACH = 16 ppm, while for the CARDY it was 50. While the CARDY meter is easier to use and has fewer steps, the HACH electrode values were closer to the true readings and less erratic. One must use care when interpreting nitrate sufficiency value ranges with different quick-test techniques.

Удобрение перца сладкого

2018 ◽  
Author(s):  
V.A. Borisov ◽  
A.M. Menshikh ◽  
V.S. Sosnov ◽  
G.F. Monakhos
Keyword(s):  
Drip Irrigation ◽  
Sweet Pepper ◽  
Water Soluble ◽  
Mineral Fertilizers ◽  
High Quality ◽  
Organic Mineral ◽  
Soluble Fertilizer

Показано действие минеральных удобрений, микрокристаллического комплексного водорастворимого удобрения «Мастер» и органоминерального наноудобрения с ростостимулирующей активностью «Арксойл» при капельном орошении на урожайность и качество сладкого перца нового гибрида F1 Темп. Сочетание основного удобрения с листовой и корневой подкормками позволяет получить до 65 т/га плодов перца высокого качества.The action of mineral fertilizers, microcrystalline complex water soluble fertilizer Master and organic mineral nano-fertilizer with growth-stimulating activity Arksoil under drip irrigation on the productivity and quality of sweet pepper of the new hybrid F1 Temp is shown. The combination of basic fertilizer with leaf and root fertilizing allows to obtain up to 65 t/ha of pepper fruits of high quality.

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