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| "text": "Via injectie van vloeibare stikstof is de meerwaarde van vloeibare meststof aangetoond. In 2007 bracht deze vorm 9 procent meer jaaropbrengst dan korrels.", |
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| "text": "Vloeibaar geeft meer opbrengst dan korrels", |
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| "text": "In het verleden zijn diverse onderzoeken verricht naar vloeibare meststoffen. Maar bij toedieningen via veldspuit of sleepslangetjes kwamen er meestal lagere of hooguit gelijke grasopbrengsten uit. Vervluchtiging zou de grote boosdoener zijn. Nu is sinds enkele jaren de spaakwielbemester, waarmee de vloeibare mest in de grond wordt geïnjecteerd, actief. Dus kon Animal Sciences Group van Wageningen UR met boerengeld van het Productschap Zuivel in 2007 opnieuw de vloeibare vorm beoordelen. Want door injectie in de bodem is kans op vervluchtiging minder of nihil.", |
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| "text": "Cijfers op zandgrond", |
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| "text": "In het onderzoek is niet gekozen voor Anasol, de vloeibare stikstof die nu het meest in de praktijd wordt gebruikt. Korrels en vloeibare meststof in het onderzoek zijn exact gelijk van samenstelling (50 procent ammonium en 50 procent nitraat, overeenkomstig met de samenstelling KAS), zodat ze goed te vergelijken zijn. Op een perceel blijvend grasland op de Overijsselse zandgrond is een uitgebreide proef verricht zonder gebruik van dierlijke mest. Naast een nul-", |
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| "text": "bemesting was er een laag, een middel en een hoog stikstofbemestingsniveau. Binnen deze drie niveaus zijn diverse perceeltjes in het groeiseizoen één, twee, drie of vier keer bemest. Dus sommige percelen kregen alleen in het voorjaar stikstof in korrel- of vloeibare vorm, om de nawerking te beoordelen. De perceeltjes zijn vijf keer gemaaid.", |
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| "text": "Na analyse van alle gegevens was onderzoeker Herman de Boer van ASG verrast. Injectie van stikstof met een spaakwielbemester gaf in 2007 op grasland 9 procent meer jaaropbrengst dan met korrelstrooien: 14,3 tegenover 13,1 ton droge stof per hectare, tegenover 7,4 ton bij nulbemesting (zie grafiek 1).", |
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| "text": "De eiwitopbrengst steeg bij injectie zelfs met 20 procent doordat er ook nog eens hogere eiwitwaarden in het geoogste gras gevonden werden. Per 100 kilo verstrekte stikstof kwam bij de korrels 85 kilo stikstof via het gras terug. Bij de geïnjecteerde grasveldjes kwam 115 kilo stikstof terug via het gras. Ofwel een 36 procent betere stikstofbenutting van vloeibare, geïnjecteerde mest. „Duitse onderzoeken met spaakwielbemesters lieten 10 tot 20 procent hogere stikstof-", |
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| "text": "benutting zien. Dus was die 36 procent wel verrassend hoog”, vond De Boer, die benadrukt dat dit eenjarige cijfers op zandgrond zijn. In 2008 zal eenzelfde onderzoek op zware kleigrond in Friesland plaatsvinden en hij hoopt dat er in 2009 nog onderzoeksgeld beschikbaar is om op veen hetzelfde project te starten.", |
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