Development of Fertigation for Trickle Irrigated Vegetables Under Mediterranean Conditions

Kreij, C. de; Kavvadias, Victor; Assimakopoulou, Anna; Paraskevopoulos, A.

doi:10.1300/j512v13n02_08

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…These values are considerably less than the minimum value 4.5 mmol L −1 used in The Netherlands [24,27]. In the Mediterranean Basin, this method has been investigated in Italy [24] and Greece [28]. Minimum sufficiency values for Italy were less than those in The Netherlands [29], but not as low as in the present study.…”

Section: Relationship Between [No3 − ] Of the 1:2 Soil To Water (V/v)contrasting

confidence: 69%

“…The variable water content in the soil samples for the extraction of [NO 3 − ] in the 1:2 extract is not a limitation for the interpretation of the results. The variation in the water content of the soil did not affect the interpretation of results, for the ranges of soil water content commonly encountered in intensive vegetable production [28]. Practical advantages of the extract method are that it only requires a single visit to the greenhouse for each measurement, and that taking soil samples can be done rapidly.…”

Section: General Considerations Of the Use Of The Soil Solution And 1mentioning

confidence: 98%

“…Lower and upper and sufficiency values are available for the 1:2 soil to water (v/v) extract method for vegetable and ornamental crops grown in soil in Dutch greenhouses [18,24,27]. Some work with this method has been conducted in Greek and Italian greenhouses [27,28]. However, sufficiency values for those conditions have not been published, although suggested unpublished sufficiency values are lower than those used in The Netherlands [29].…”

Section: Introductionmentioning

confidence: 99%

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Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

et al. 2020

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Excessive N application occurs in greenhouse vegetable production. Monitoring methods of immediately available soil N are required. [NO3−] in soil solution, sampled with ceramic cup samplers, and [NO3−] in the 1:2 soil to water (v/v) extract were evaluated. Five increasing [N], from very N deficient (N1) to very N excessive (N5) were applied throughout three fertigated pepper crops by combined fertigation/drip irrigation. The crops were grown in soil in a greenhouse. Soil solution [NO3−] was measured every 1–2 weeks, and extract [NO3−] every 4 weeks. Generally, for treatments N1 and N2, both soil solution and extract [NO3−] were continually close to zero, and increased with applied [N] for treatments N3–5. The relationships of both methods to the nitrogen nutrition index (NNI), an indicator of crop N status, were assessed. Segmented linear analysis gave R2 values of 0.68–0.70 for combined data from entire crops, for both methods. NNI was strongly related to increasing [NO3−] up to 3.1 and 0.9 mmol L−1 in soil solution and extracts, respectively. Thereafter, NNI was constant at 1.04–1.05, with increasing [NO3−]. Suggested sufficiency ranges were derived. Soil solution [NO3−] is effective to monitor immediately available soil N for sweet pepper crops in SE Spain. The extract method is promising.

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Section: Relationship Between [No3 − ] Of the 1:2 Soil To Water (V/v)contrasting

confidence: 69%

Section: General Considerations Of the Use Of The Soil Solution And 1mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

et al. 2020

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“…Analysis of the extract following sampling at key times is used to make fertigation recommendations (de Kreij et al, 2007).…”

Section: :2 Soil:water Extract Methodsmentioning

confidence: 99%

Organic matter fractions and N mineralization in vegetable‐cropped sandy soils

Jegajeevagan

Sleutel

Ameloot

et al. 2013

Soil Use and Management

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Soil organic nitrogen mineralization rates and possible predictors thereof were investigated for vegetable‐growing soils in Belgium. Soil organic matter (SOM) was fractionated into sand (> 53 μm) and silt+clay (< 53 μm) fractions. The latter fraction was further separated into 6%NaOCl‐oxidation labile (6%NaOCl‐ox) and resistant N and C and subsequently into 10%HF‐extractable (mineral bound) and resistant (recalcitrant) N and C. The N mineralization turnover rate (% of soil N/year) correlated with several of the investigated N or C fractions and stepwise linear regression confirmed that the 6%NaOCl‐ox N was the best predictor. However, the small R² (0.42) of the regression model suggests that soil parameters other than the soil fractions isolated here would be required to explain the significant residual variation in N mineralization rate. A next step could be to look for alternative SOM fractionations capable of isolating bioavailable N. However, it would appear that the observed relationships between N fractions and N mineralization may not be causal but indirect. The number of vegetable crops per rotation did not influence N mineralization, but it did influence 6%NaOCl‐ox N, probably as an effect of differences in crop residues returned and organic manure supply. However, the nature of this relation between management, SOM quality and N mineralization is not clear. Explanation of correlations between N mineralization and presumed bioavailable N fractions, like the 6%NaOCl‐ox N, requires further mechanistic elucidation of the N mineralization process.

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“…However, the most popular approach based on soil testing is probably the "Fertigation Model" [49] initially developed by Dutch researchers [117,119] before being used across Europe. The method has been extensively adopted at the commercial level in the Netherlands [100], and by growers from Mediterranean countries such as Italy [52] and Greece [128]. In Italy, the method can be applied with the user-friendly software GreenFert [52] (http://www.cespevi.it/softunipi/greenfert.html).…”

Section: Decision Support Systems Based On Crop Monitoringmentioning

confidence: 99%

New Trends in the Fertigation Management of Irrigated Vegetable Crops

2017

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Abstract:The use of fertigation, coupled with micro-irrigation, has continued to increase since it was first introduced in horticultural cropping systems. This combination provides a technical solution whereby nutrients and water can be supplied to the crop with high precision in terms of time and space, thereby allowing high nutrient use efficiency. However, the correct estimation of crop nutrient and water needs is fundamental to obtaining precise plant nutrition and high nutrient use efficiency in fertigated cropping systems. This paper illustrates the state-of-the-art and new perspectives for optimal nutrient management of vegetable crops cultivated under fertigation regimes. An overall description is reported for the most valuable technologies and techniques based on simulation models, soil testing, plant testing, and related decision support systems that can be adopted for efficient fertigation. However, it should be highlighted that only a few of the above technologies and techniques are practically available and/or easy to use by growers. Therefore, much more attention should be paid in the future to the transfer of research knowledge to farmers and technical advisors.

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Development of Fertigation for Trickle Irrigated Vegetables Under Mediterranean Conditions

Cited by 6 publications

References 12 publications

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

Organic matter fractions and N mineralization in vegetable‐cropped sandy soils

New Trends in the Fertigation Management of Irrigated Vegetable Crops

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