Abstract
This article describes the effects of three seeding unit designs on plant residue clearance along the central line ofdirect corn (Zea Mays L.) seeding and the subsequent influence on crop emergence. The equipment assemblies testedwere three different combinations of the implements turbo coulter blade (TCB), double disc opener with a seed presswheel and covering/packing wheels (DDO), notched disc row cleaner with a track wheel or floating star cleaner (RC)as follows: (1) TCB+DDO, (2) RC+TCB+DDO and (3) TCB+RC+DDO. Under the field conditions tested, residueclearance before the cutting action of the turbo coulter blade (combination 2) gave rise to the best crop stand and cropuniformity. The seeding assembly that moves soil and clears away plant debris along the seeding furrow shows a directeffect on seed emergence.
Highlights
An experiment on regulated def icit irrigation (RDI) was performed from 1995 to 1997 in a drip-irrigated orchard of ‘Clementina de Nules’/‘Carrizo Citrange’ in Moncada (Valencia) Spain
RDI was measured at two levels (25% and 50% ET lys) during the three more relevant phenological stages: I) flowering and fruit set, II)
Good correlation was recorded between total shoot emergence in different sprouting phases and the stress intensity caused by RDI treatments
Summary
Los tratamientos de riego deficitario se aplicaron durante 1995 y 1996 a dos niveles (25% y 50% ETlis) en los tres periodos fenológicos principales: I) floración-cuajado, II) crecimiento rápido del fruto, III) crecimiento final y maduración. Desde 1985 se viene aplicando un tratamiento de riego deficitario permanente al nivel del 50% ETlis durante todo el año. Todos los tratamientos de riego se compararon con un control, que se mantuvo bien regado durante toda la temporada al 125% ETlis. La caída de flores y frutitos se evalúo en el año 1995 mediante mallas de 4 × 2,5 (m × m) colocadas bajo la copa de los árboles, a razón de 3 y 4 mallas por parcela elemental en los tratamientos de riego y control, respectivamente. Se contó el número de órganos fructíferos en alícuotas de unos 15 g de peso seco, y se calculó el número total de órganos florales por malla mediante la relación peso fresco/peso seco
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