Rotation

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Rotation

An active asset management strategy that tactically overweighted and underweighted certain sectors, depending on expected performance. Sometimes called sector rotation.

Sector Rotation

An investment strategy in which a portfolio overweights or underweights certain sectors in accordance with expected performance. Sector rotation is a form of active investment management; the portfolio manager observes market trends and alters the composition of the portfolio in order to earn the highest possible return. Sector rotation is fairly high risk, as a portfolio's systematic overweighting and underweighting means that is not efficiently diversified. See also: Markowitz portfolio theory.

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Favorable responses to spot and strip fumigation treatments in the almond orchard replant trials and to crop rotation in the microplot trials led to validations in a peach orchard replant trial.

There was no significant interaction between soil fumigation and crop rotation in annual or cumulative yields (P > 0.

Managing the almond and stone fruit replant disease complex with less soil fumigant

05) separation between treatments including: (i) continuous wheat and all crop rotation and crop-pasture rotation treatments; (ii) crop rotation-DD and both crop rotation-NT treatments; and (iii) annual pasture and both crop rotation-NT treatments.

Relationships between soil organic matter and the soil microbial biomass (size, functional diversity, and community structure) in crop and pasture systems in a semi-arid environment

2006) found that during 24 years of experimentation on a Chromic Luvisol, crop rotations and tillage methods did not significantly affect the dynamics of Pi, and the transfer of P to deeper soil layers was limited.

Soil P dynamics within the profile is affected by crop rotation, stubble management, and tillage practices, in part reflecting changes in the organic P (Po) pools (Bunemann et al.

Tillage system affects phosphorus form and depth distribution in three contrasting Victorian soils

This shows that crop rotation and tillage practices have a greater effect on yields than any 'advantages' that might be offered by climate change, such as growth-boosting and water-saving effects from C[O.

Hotter summers: could trump C[O.sub.2] benefits on dry cropland

1998) studied the residual effects of various crop rotations on wheat yields, soil N, and SOC in a rainfed black Vertosol, and similarly reported that the residual effects of grain legume rotation crops on these soil properties and wheat yields were short-lived.

Residual effects of cotton-based crop rotations on soil properties of irrigated Vertosols in central-western and north-western New South Wales

Had we only looked for changes in total carbon or organic matter, we might have concluded erroneously that pastures and crop rotations had no effect on soil microbial properties," Acosta-Martinez says.

For want of microbes, soil processes and function could be lost

REAP can account for the effects of crop rotations, production practices, soil types, and geographical characteristics of specific regions," says ERS economist Scott Malcolm.

Economic and biophysical models aid the process

Years of conventional tillage, coupled with little crop rotation, have severely depleted the soil organic matter--in some areas to less than 1 percent.

Preserving Tennessee Valley Soils

Foxtail millet joins other crops like proso millet and sunflowers in crop rotations that are slowly replacing the older routine of wheat one year, then fallow the next.

Foxtail millet for the central plains

A 3-year crop rotation with IPM challenges traditional farming in eastern Washington and Idaho.