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Handbook
Yield and yield components: a practical guide for comparing crop management practices
(CIMMYT, 2013)
Agronomic practices are evaluated using yield data so it is essential the yield information is representative and reliable. The purpose of this manual is to explain in practical terms how to obtain such data. The manual ...
Handbook
Soil aggregate stability by wet sieving: a practical guide for comparing crop management practices
(CIMMYT, 2013)
Soils are subjected to spatial and temporal alterations of aggregates and pores caused by natural (pedogenesis) and anthropogenic (management) factors (Lal and Shukla, 2004). In fact, soil aggregate distribution is a static ...
Handbook
Soil aggregate distribution by dry sieving: a practical guide for comparing crop management practices
(CIMMYT, 2013)
From a physical perspective, the soil matrix is generally conceptualized as being constituted by soil aggregates (filled spaces) or secondary soil units, and pores (empty spaces) (Soil Science Society of America, 1997; Lal ...
Handbook
Cracking: a practical guide for comparing crop management practices
(CIMMYT, 2013)
Soil cracking can occur when wet or moist soil dries and is common in soils with a high swell-shrink clay content. Evaporation of soil pore water leads to a build-up of negative pressure which results in a reduction of ...
Handbook
Penetration resistance: a practical guide for comparing crop management practices
(CIMMYT, 2013)
Penetration resistance is an indicator for the level of compaction of the soil. Compaction limits root growth and the availability of air and water to the roots (Herrick and Jones, 2002; Lampurlanés and Cantero-Martínez, ...
Handbook
Infiltration: a practical guide for comparing crop management practices
(CIMMYT, 2013)
Infiltration rate is the velocity or speed at which water enters into the soil. It is usually measured by the depth (in mm) of the water layer that can enter the soil in one hour. An infiltration rate of 15 mm/hour means ...
Handbook
Soil water content: a practical guide for comparing crop management practices
(CIMMYT, 2013)
The water content of a soil is a complementary and necessary indicator in many soil analyses. Soil water content has traditionally been expressed as the ratio of the mass of water present in a sample to the mass of the ...
Handbook
Mulch cover: a practical guide for comparing crop management practices
(CIMMYT, 2013)
Mulch cover is formed when crop residues are retained on a field. Mulch cover is considered an important natural resource for conserving and improving the soil, especially in conservation agriculture. In conservation ...
Handbook
Infiltración: guía útil para comparar las prácticas de manejo de cultivo
(CIMMYT, 2013)
La velocidad de infiltración es la velocidad con la cual el agua penetra en el suelo. Generalmente se mide con base en la profundidad (en mm) de la lámina de agua que logra penetrar en el suelo en una hora. Una velocidad ...
Handbook
Distribución de los agregados del suelo tamizando en seco: guía útil para comparar las prácticas de manejo de cultivo
(CIMMYT, 2013)
Desde una perspectiva física, generalmente se piensa que la matriz del suelo está constituida por agregados del suelo (espacios llenos) y poros (espacios vacíos) (Soil Science Society of America, 1997; Lal y Shukla, 2004). ...