Self-incompatibility (SI) prevents the creation of homozygous parental lines by selfpollination for hybrid breeding in perennial ryegrass (Lolium perenne L.). Although SI is highly effective, its breakdown leading to self-fertility (SF) has been reported. Recent research has fine-mapped one major locus conferring SF in a perennial ryegrass population to a 1.6 cM region on linkage group (LG) 5 (Do Canto et al., 2017). Our goal was to confirm, by marker-trait association using genome-wide markers, this previously described locus as being solely responsible for SF variation.

ABSTRACT. Chlorophyll meters are promising tools for improving the nitrogen (N) management of vegetable crops. To facilitate on-farm use of these meters, sufficiency values that identify deficient and sufficient crop N status are required. This work evaluated the ability of three chlorophyll meters (SPAD-502, atLEAF+, and MC-100) to assess crop N status in sweet pepper. It also determined sufficiency values for optimal N nutrition for each meter for pepper.

ABSTRACT. Knowledge about contributing factors to yield loss is essential for sustainable intensification of agriculture, which has the objective to increase both, yield and environmental sustainability. This study aimed to identify strategies to reduce the distance between under-performing and best-yielding greenhouse tomato crops in the south region of Uruguay. Gap to attainable yield was described and main causes of yield variability were explored by combining regional agronomic diagnosis and yield gap analysis.

ABSTRACT. Knowledge about contributing factors to yield loss is essential for sustainable intensification of agriculture, which has the objective to increase both, yield and environmental sustainability. This study aimed to identify strategies to reduce the distance between under-performing and best-yielding greenhouse tomato crops in the south region of Uruguay. Gap to attainable yield was described and main causes of yield variability were explored by combining regional agronomic diagnosis and yield gap analysis.

CONTENIDO. 1.- Calidad de vida para el tambero y bienestar para las vacas:posibles ventajas del tambo robotizado analizadas por INIA. (Ing. Agr. (PhD.) Santiago Fariña, Director del Programa de Investigación en Lechería). 2.- Nuestras mandarinas son competitivas con las mejores variedades del mundo. (Ing. Agr. (Ph.D.) Fernando Rivas, Director del Programa Nacional de Investigación en Producción Citrícola). 3.- Hoy en Uruguay es posible producir morrones en invernáculo casi sin insecticidas. Ing. Agr.

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