{"id":9955,"date":"2024-05-08T11:51:55","date_gmt":"2024-05-08T15:51:55","guid":{"rendered":"https:\/\/maizex.com\/?p=9955"},"modified":"2024-05-08T12:00:32","modified_gmt":"2024-05-08T16:00:32","slug":"impact-des-delais-de-semis-sur-le-rendement-et-la-rentabilite","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/impact-des-delais-de-semis-sur-le-rendement-et-la-rentabilite\/","title":{"rendered":"Impact des d\u00e9lais de semis sur le rendement et la rentabilit\u00e9"},"content":{"rendered":"\n

Il pleut et les conditions ne semblent pas vouloir s\u2019am\u00e9liorer. Le sujet de l\u2019heure est bien entendu doit-on changer les UTM de notre ma\u00efs ou changer de culture pour du soya?

Les printemps avec un semis retard\u00e9 cr\u00e9ent beaucoup de frustrations pour tout le monde impliqu\u00e9 dans la culture du ma\u00efs. L\u2019une des questions agronomiques qui se posent lorsque le semis est s\u00e9rieusement retard\u00e9 est de savoir si les agriculteurs devraient envisager de changer leurs hybrides \u00e0 maturit\u00e9 pleine saison pour des hybrides \u00e0 maturit\u00e9 plus courte. La question se fonde, sur le risque per\u00e7u de la culture qui n\u2019atteint pas la maturit\u00e9 physiologique avant un gel d\u2019automne mortel et les pertes de rendement qui pourraient en r\u00e9sulter. Une pr\u00e9occupation connexe et \u00e9conomique, avec le semis retard\u00e9 d\u2019hybrides pleine saison est le risque de teneur \u00e9lev\u00e9e en humidit\u00e9 des grains \u00e0 la r\u00e9colte et les co\u00fbts r\u00e9sultant du s\u00e9chage du grain.

Selon Bob Neilson de l\u2019Universit\u00e9 de Purdue en Indiana, l\u2019agriculteur devrait conserver les hybrides de maturit\u00e9 pleine saison avec les UTM adapt\u00e9es \u00e0 sa zone lorsque le semis est retard\u00e9. Changer de maturit\u00e9 r\u00e9duirait consid\u00e9rablement la rentabilit\u00e9 associ\u00e9e \u00e0 la culture du ma\u00efs. Les hybrides de ma\u00efs s\u2019adaptent au semis tardif en r\u00e9duisant leur p\u00e9riode v\u00e9g\u00e9tative afin de maturer dans un d\u00e9lai raisonnable.

Une \u00e9tude de Jeschke, Mark and Steve Paszkiewicz, d\u00e9montre que les hybrides de ma\u00efs pleine saison devraient \u00eatre maintenus jusqu\u2019au 24 mai. Voir le graphique #1. Apr\u00e8s cette date, il est fortement recommand\u00e9 de changer de maturit\u00e9 de ma\u00efs ou de changer de culture pour faire du soya. Pour le Qu\u00e9bec la date du 20 mai est plus adapt\u00e9e et en ligne avec la Financi\u00e8re agricole.<\/strong><\/p>\n\n\n\n

Graphique #1<\/em><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

En analysant le croisement des donn\u00e9es provenant de l\u2019universit\u00e9 de Cornell dans l\u2019\u00e9tat de New York avec celle de l\u2019OMAFRA sur l\u2019impact d\u2019un d\u00e9lai de semis sur le rendement dans le tableau #1.

Il faut prendre en consid\u00e9ration que le rendement estim\u00e9 est toujours en fonction d\u2019une ann\u00e9e de culture. Le rendement est en relation avec le maximum de rendement atteignable durant cette ann\u00e9e pr\u00e9cise. On ne peut comparer les dates de semis entre elles sur plusieurs ann\u00e9es, car elles ne sont pas dans le m\u00eame contexte climatique.

En analysant les donn\u00e9es, la zone en jaune indique le rendement optimum en fonction de la date de semis. Le seuil d\u00e9cisionnel se situe \u00e0 partir du 24 mai. Cette date entra\u00eene une r\u00e9flexion \u00e0 propos de quelles cultures on doit semer. Selon le tableau, le rendement estimable se situe entre 86 % et 95 % pour le ma\u00efs et de 98 % pour le soya.

Il est donc plus rentable de semer du soya apr\u00e8s cette date au Qu\u00e9bec.<\/p>\n\n\n\n

Rendement en grain pr\u00e9vu selon les dates de semis<\/em><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Pour avoir une d\u00e9cision encore plus claire, deux chercheurs de l\u2019Illinois ont d\u00e9velopp\u00e9 un outil permettant de prendre une d\u00e9cision sur la culture \u00e0 semer en fonction de la date de semis, du co\u00fbt de production et de la valeur marchande des grains. Cet outil est bas\u00e9 sur les conditions de l\u2019Illinois et doit \u00eatre l\u00e9g\u00e8rement adapt\u00e9 en fonction de l\u2019endroit o\u00f9 l\u2019on se situe et le potentiel de notre zone, voir le graphique #2 tir\u00e9 de cet outil.

Le seuil de rentabilit\u00e9 entre la culture du ma\u00efs et celle du soya se croise environ \u00e0 la date du 24 mai. Une fois cette date butoir pass\u00e9e, la rentabilit\u00e9 du soya demeure sup\u00e9rieure au ma\u00efs pour le reste de la saison.<\/p>\n\n\n\n

Graphique #2<\/em><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

En conclusion, rien ne justifie un changement de culture jusqu\u2019au 24 mai en respectant les \u00e9ch\u00e9anciers dict\u00e9s par la Financi\u00e8re agricole concernant les UTM relatives \u00e0 votre r\u00e9gion.

Apr\u00e8s cette date, selon les conditions climatiques du moment, un changement de culture serait une d\u00e9cision \u00e9clair\u00e9e et justifiable pour assurer la rentabilit\u00e9 de l\u2019entreprise.

<\/p>\n\n\n\n

R\u00e9f\u00e9rences:<\/em>
Nielsen, R.L. (Bob). 2012. Interpreting Corn Hybrid Maturity Ratings. Corny News Network, Purdue Univ. http:\/\/www.kingcorn.org\/news\/timeless\/HybridMaturity.html<\/a> [URL accessed May 2019].

Nielsen, R.L. (Bob). 2017. Heat Unit Concepts Related to Corn Development. Corny News Network, Purdue Univ. http:\/\/www.kingcorn.org\/news\/timeless\/HeatUnits.html<\/a> [URL accessed May 2019].

Nielsen, R.L. (Bob). 2018. Grain Fill Stages in Corn. Corny News Network, Purdue Univ. http:\/\/www.kingcorn.org\/news\/timeless\/GrainFill.html <\/a>[URL accessed May 2019].

Nielsen, R.L. (Bob). 2019a. Optimum Plant Populations for Delayed Planting of Corn. Corny News Network, Purdue Univ. http:\/\/www.kingcorn.org\/news\/timeless\/CornPltPopPltDate.html<\/a> [URL accessed May 2019].

Nielsen, R.L. (Bob). 2019b. The Planting Date Conundrum for Corn. Corny News Network, Purdue Univ. http:\/\/www.kingcorn.org\/news\/timeless\/PltDateCornYld.html<\/a> [URL accessed May 2019].

Nielsen, Robert L., Peter R. Thomison, Gregory A. Brown, Anthony L. Halter, Jason Wells, and Kirby L. Wuethrich. 2002. Delayed Planting Effects on Flowering and Grain Maturation of Dent Corn. Agron. J. 94:549-558.

Jeschke, Mark and Steve Paszkiewicz. Hybrid Maturity Switches Based on Long-Term Research. Pioneer (Corteva agriscience, an Agriculture Division of DowDuPont). https:\/\/www.pioneer.com\/home\/site\/us\/agronomy\/library\/corn-hybrid-maturity-switches<\/a> [URL accessed May 2019]

Schnitkey, Gary and Ryan Batts. 2011. Planting Delays and Switching to Soybeans: A New FAST Spreadsheet. Univ. of Illinois Extension. [online] http:\/\/farmdoc.illinois.edu\/manage\/newsletters\/fefo11_08\/fefo11_08.html<\/a>. [URL accessed May 2011].

http:\/\/css.cals.cornell.edu\/cals\/css\/extension\/cropping-up\/archive\/upload\/WCUVol21No1-PlantingDates.pdf<\/a>

http:\/\/www.agry.purdue.edu\/ext\/corn\/news\/articles.11\/SafeHybridMaturities-0517.html<\/a>

Guide agronomique des grandes cultures. Publication 811F

Pascal Larose agr.
Chef de produits et agronomie
Qu\u00e9bec et Maritimes<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

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