Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 414851
Title Comparison of split nitrogen appliacation strategies in leek (Allium porrum) to reduce N fertilization on sandy soils in the Netherlands
Author(s) Geel, W.C.A. van; Meurs, E.J.J.; Radersma, S.; Grashoff, C.
Source In: Proceedings of the International Symposium Towards Ecologically Sound Fertilisation Strategies for Field Vegetable Production. - ISHS - p. 241 - 246.
Event International Symposium Towards Ecologically Sound Fertilisation Strategies for Field Vegetable Production, 2008-09-22/2008-09-29
Department(s) PPO Arable Farming, Multifunctional Agriculture and Field Production of Vegetables
Centrum voor Genetische Bronnen Nederland
Publication type Contribution in proceedings
Publication year 2006
Abstract High nitrogen (N) fertilization to maximize production of leek (Allium porrum L.) combined with low N recovery can lead to considerable nitrogen pollution of the environment. A field trial was conducted in 2002 and 2003 on a sandy soil in the Netherlands. To synchronize N supply and N demand, two strategies of sequential split nitrogen application (SNA) were compared: 1) SNA-soil: in which the split N applications are the difference between standardized crop demand and the available amount of mineral N in the soil for each period; 2) Crop Scan method: in which the split N applications are derived from comparing the actual crop nitrogen status to the desired nitrogen status, using crop reflectance measurements and a crop growth model. Total fertilizer application according to Crop Scan method in 2002 saved 65 kg N ha-1 compared to recommendation of SNA-soil, maintaining maximal production. In 2003 the total N application of SNA-soil and Crop Scan were respectively 95 and 113 kg N ha-1, whereas a N application of 45 kg N ha-1 was sufficient. The Crop Scan method overestimated the N application needed in 2003 because it did not account for the high mineral N content in the soil. SNA-soil overestimated the N application needed in autumn in both years. Combination of Crop Scan measurements, to assess plant N need, and soil N analysis may cover the flaws, which each method separately showed.
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