1,721,056 research outputs found
Effects of a new wide-sweep opener for no-till planter on seed zone properties and root establishment in maize (Zea mays, L.): A comparison with double-disk opener
No full textAccording to the kind of opener applied, no-tillage seeders can variously modify soil physical properties in relation to soil and climate conditions, thus potentially affecting crop emergence and early growth.
The technological evolution of seeders for direct drilling of arable crops, progressively achieved in recent years, has been considerable, but new improvements now available need to be individually tested. In a field trial at Udine (NE Italy), the effects of a new kind of wide-sweep opener (i.e., side coulters curved upwards in their final part and slightly angled towards the direction of work) on soil physical properties in the seed zone and on crop emergence and early root growth of maize were evaluated in four different soils over a 2-year period (2002–2003), in comparison with the widely used double-disk opener.
With respect to the double-disk opener, in general the wide-sweep type led to higher soil–residue mixing—without excessive reduction of the soil-covering index being observed, ��27 and ��6%, respectively. The wide-sweep opener also showed lower bulk density and soil penetration resistance in the top 5-cm soil layer of the seed furrow, although no greater root length density was found in maize at the three-leaf stage, probably due to the smoothing effect caused by the side coulters at the seeding depth. A certain delay in plant emergence in some cases was also revealed for the wide-sweep opener, which may be related to the lower soil/seed contact.
Deviations from this general behaviour in the various soils (texture and initial conditions) are discussed
Il ruolo delle misure nella progettazione di sistemi wireless per applicazioni industriali
No full textRiferibilità della strumentazione in un laboratorio di prove di compatibilità elettromagnetica
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Tenuta sotto controllo di strumentazione per un laboratorio di compatibilità elettromagnetica
No full textIl ruolo delle misure nella progettazione di sistemi wireless per applicazioni industriali
No full textInfluenza della tessitura e del contenuto di sostanza organica del suolo sulla stabilità temporale della variabilità spaziale della resa in una rotazione di mais, soia e frumento.
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Tecniche di adattamento automatico della velocità di trasmissione per reti di comunicazione industriale basate su IEEE 802.11
No full textNonuniform Low Frequency Magnetic Field Measurements
No full textIn this paper, measurement accuracy is analyzed for the
case of magnetic field estimation. Uncertainty due to non-uniformity
of field and probe orientation is investigated. The case-study associ-
ated to heating induction installation is discussed
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