Five-year investigations were carried out on the experimental drainage field ''Jelenscak'', Kutina, in Croatia. The field is situated in the Sava River valley, on gleyic podzoluvisol. The trial involved eight pipedrainage variants, differing in drainpipe spacing and backfilling. Drainpipe spacings of 15, 20, 25 and 30 m with gravel backfill and spacings of 10, 15, 20 and 25 m without gravel backfill were tested. The shortest duration of drainage outflow was recorded in the variant with a drainpipe spacing of 15 m with gravel backfill and in the variant with a drainpipe spacing of 10 m without gravel backfill. These values are significantly different (P < 0.01) compared to the values obtained in other variants. Average monthly drainage outflows in the said two drainage variants are also significantly higher compared to the other test variants (P < 0.01). The outflow peak in the studied variants ranged from 12. Les valeurs instantanés de drainage ont varié de 12.3 mm jusqu'à 64.9 mm j À1 . Les valeurs d'écoulement de drainage calculées par modèle mathématique SWAP-93 dans la même période (1996-99) ont été confirmées par mesures directes dans le champ expérimental avec la précision de 95.8%.
The basic aim of this research is to determine the influence of various types of pipe drainage upon the water release rate in the process of drying wheat and corn kernels grown on a hydromorphic type of soil. The research was conducted during a period of three years (1998)(1999)(2000)(2001). Seven different types of drainage systems were built on pseudogleyic-gleyic soil (various spacings of drainage pipes with gravel used or not used in the drainage trench above the pipes). Based on soil moisture measurement data (to a soil depth of 60 cm), acquired by means of the gravitational method in the period of vegetation, it is clear that the most favourable humidity occurred on soil with spacing of drainage pipes being 25 m, gravel used, with both cultures. The yield gained also shows that this drainage type is the most favourable. The process of drying the kernels to the storage humidity value took the shortest time with this type of drainage.Results of this research contribute to energy savings in the process of drying wheat and corn crops. Additionally, the results can be used for selecting systems of drainage in dealing with excess water on hydromorphic soil types. RÉ SUMÉ Le but principal de cette recherche était de déterminer l'influence de différents systèmes de drainage par canalisations sur la vitesse de séchage des grains de céréales (froment et mais) en sols hydromorphes. Ces recherches se sont déroulées sur trois ans (1998)(1999)(2000)(2001). Sept types de drainage différents ont été installés sur des sols 'pseudogleyic-gleyic' (espacements différents entre canalisations, utilisation ou non de gravier dans les tranchées situées au dessus des canalisations). D'après les résultats des mesures d'humidité du sol (jusqu'à 60 cm de profondeur), obtenues par la méthode gravitationnelle en phase de végétation, il est clair que le taux d'humidité du sol le plus favorable est obtenu avec un espacement de 25 m entre les canalisations, en utilisant du gravier, pour les deux cultures. Le rendement obtenu montre aussi que ce type de drainage est le plus favorable. Le processus de séchage des épis jusqu'au taux d'humidité requis pour le stockage a été le plus rapide avec ce type de drainage.Les
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