An empirical model for describing growth and nitrogen uptake of white cabbage (Brassica oleracea var. capitata)

Fink, M.; Feller, C.

doi:10.1016/s0304-4238(97)00154-4

Cited by 15 publications

(15 citation statements)

References 8 publications

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“…The figure clearly shows that, above a certain threshold value for N av (approximately 300 kg ha −1 ), N up remains constant at a maximum of 180 kg ha −1 This generalized logistic function was adjusted according to the following expression:

{normalN}_{up} = \frac{H}{{(1 + T \times {normale}^{(- b \times (N_{av} - M))})}^{\overset{}{true} / \underset{}{true}}}

where H is the upper asymptote, T depends on the value of N up when N av is null, b is the uptake rate, and M is the N av of the maximum N uptake rate. This type of equation has been used widely for crop N content with time (Fink and Feller, 1998). Assuming that the lower asymptote was null and that M was 90 kg ha −1 , based on the optimum N up value, we plotted the curve in Fig.…”

Section: Resultsmentioning

confidence: 99%

Efficiency Indexes for Melon Crop Optimization

Castellanos¹,

Cartagena

Ribas³

et al. 2010

Agronomy Journal

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Th e present study reviews the most common N effi ciency indexes with a view to maximizing yield and minimizing N loss, for melon grown in a zone where the water supply has a high nitrate content due to environmental degradation. Th e N use effi ciency (NUE) values of the study were those relating the fruit yield (FY) and the dry weight (DW) with N applied (N ap ), N available (N av ), and N uptake (N up ), which were denominated NUE 1 , NUE 2 , NUtE, NUE 3 , NUE 4 , and NUE 5 , respectively. A 3-yr fi eld experiment (2005, 2006, and 2007) was performed from May to September in central Spain. Melon crops were irrigated at 100% of the ET c (crop evapotranspiration) and 11 N rates, ranging from 11 to 393 kg ha -1 (considering N fertilizer [N f ], applied over 10 wk, and N in the irrigation water [N w ], where the NO 3 concentration was 5.58, 80.64, and 10.89 mg L -1 in 2005, 2006, and 2007, respectively), were applied to a soil classifi ed as Alfi sol Xeralf Petrocalcic Palexeralfs. Th e results show a clear relationship between crop N up and both FY and DW. Of the potential yield, 95% could be obtained with a N application of 93 kg ha -1 . Th e maximum FY was observed with a N up of 155 kg ha -1 . Th e NUE, when related to N ap and N av , showed an exponential trend and when related to N up a linear trend, delimiting a range within which the optimum value of N occurs.

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{normalN}_{up} = \frac{H}{{(1 + T \times {normale}^{(- b \times (N_{av} - M))})}^{\overset{}{true} / \underset{}{true}}}

Section: Resultsmentioning

confidence: 99%

Efficiency Indexes for Melon Crop Optimization

Castellanos¹,

Cartagena

Ribas³

et al. 2010

Agronomy Journal

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“…Fresh matter, dry, number of leaves and head diameter were measured fortnightly, starting at the third week after planting. Experimental details are given by Fink and Feller (1998).…”

Section: Experiments With White Cabbagementioning

confidence: 99%

“…Look-up tables for several field vegetables, with average time courses of N uptake, have been published (Lorenz et al, 1989;Gysi et al, 1988). Measured uptake curves, however, can show considerable differences when compared to values taken from these look-up tables Fink, 1996, 1997;Fink and Feller, 1998). The estimation of nitrogen uptake should be as accurate as possible, in order to avoid recommendations being too high or too low.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Nitrogen Uptake of Field Vegetables

Feller¹,

Fink²

1999

Acta Hortic.

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Some fertilizer recommendation systems for field vegetables are based on estimated nitrogen (N) uptake curves. The estimation of nitrogen uptake should be as accurate as possible, in order to avoid recommendations being too high or too low. Therefore, the accuracy (standard error of difference between measured and estimated values, sd) of two estimation methods was compared. Comparison was carried out with measured nitrogen uptake curves of kohlrabi (Brassica oleracea var. gongylodes L.) and white cabbage (Brassica oleracea L. var. capitata f. alba). For kohlrabi, the use of observed growth stages resulted in a small estimation error (sd = 14kg N ha-l). This method is recommended since it is accurate and easy to use. The estimation that depended on time after planting, showed a larger estimation error (sd = 28 kg N ha-1). For white cabbage, both methods tested were not suitable because estimation errors were too high (63 and 51kg N ha-l , respectively).

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“…[7] As the N uptake requirement cannot be predicted at the start of crop growth due to variable weather conditions, extra N is often applied to avoid the risk of yield reductions. Target values of N supply for optimum crop growth and N min safety margins varied from different crop species and related growth conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Nitrogen Rates on Open-Field Vegetable Growth and Nitrogen Utilization in the North China Plain

Chen

Horlacher

et al. 2004

Communications in Soil Science and Plant Analysis

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Advanced nitrogen (N) advisory systems require target values of N supply for the crop and the results of soil testing for inorganic nitrogen (N min ) before cultivation and estimates of N release from mineralization. Two field experiments with different N supply levels were conducted in the Beijing region to determine the target values of N supply and N mineralization rates for optimization of N fertilization of Chinese cabbage (Brassica campestris L. ssp. Pekinensis) and carrot (Daucus carota L.). Crop yield, N uptake, and ORDER REPRINTS soil inorganic N were investigated during the crop growth periods. Marketable yields of the two crops increased significantly with N application rate, and were described as linear-plateau functions (Chinese cabbage: Y ¼ 0.16N þ 80.5, when 0 < N 319; Y ¼ 112.7, when N ! 319; and carrot: Y ¼ 0.12N þ 50.5, when 0 < N 247; when Y ¼ 67.1, N ! 247; where: Y was marketable yield, t FW ha À1 ; N was N supply level, the sum of soil inorganic N at preplanting and applied fertilizer N, kg N ha À1 ). Similar trends were also observed in crop N uptake. The agronomically effective N supply levels for Chinese cabbage and carrot growth in Beijing region were 349 and 277 kg N ha À1 , respectively, for target marketable yields of 120 t FW ha À1 for Chinese cabbage and 65 t FW ha -1 for carrot considering extra 30 kg N ha À1 of fertilizer to avoid the risk of crop yield reduction. During the crop growth period net N mineralization in the root zone was 38 kg N ha À1 for Chinese cabbage and 46 kg N ha À1 for carrot. Weekly N mineralization rate was about 3.2 kg N ha À1 . Nitrogen loss coefficient, defined as the ratio of average weekly apparent N loss to N supply level, ranged from À0.011 to 0.053 for the different N supply levels in the two experiments. The N net mineralization rates determined, N loss rates and target values were found to be useful for prediction of optimum N supply based on N balance calculations for sustainable vegetable production.

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An empirical model for describing growth and nitrogen uptake of white cabbage (Brassica oleracea var. capitata)

Cited by 15 publications

References 8 publications

Efficiency Indexes for Melon Crop Optimization

Efficiency Indexes for Melon Crop Optimization

Estimation of Nitrogen Uptake of Field Vegetables

Effects of Different Nitrogen Rates on Open-Field Vegetable Growth and Nitrogen Utilization in the North China Plain

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