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Rice Vocs

Rice Vocs
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Pyroclastic

Pertaining to broken fragments of volcanic origin - ash and rock material.

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Pyricularia oryzae

The fungus that causes blast disease of rice.

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Pyrheliometer

A pyrheliometer is an instrument for direct measurement of solar irradiance. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. The signal voltage is converted via a formula to measure watts per square meter. It is used with a solar tracking system to keep the instrument aimed at the sun. A pyrheliometer is often used in the same setup with a pyranometer.

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Pyranometer

A pyranometer is a type of actinometer used to measure broadband solar irradiance on a planar surface and is a sensor that is designed to measure the solar radiation flux density (in watts per metre square) from a field of view of 180 degrees.

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Pyramiding genes

Combining into one genotype several major genes that control a trait.

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Pure seed

It has a high level or purity with little or no contamination of other varieties or species. Seeds give rise to genetically similar plants.

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Pure line selection

A method of selecting the best progeny for breeding from individual plants of a variety or cultivar.

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Pure line

1) A line that has been made almost completely homozygous by repeated self-pollination and selection of a specific type (or by the removal of off-types) over generations. 2) A group of identical individuals that always produce offsprings of the same phenotype when intercrossed.

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Pure culture

The growth of a single species or strain of an organism in the absence of any other living species or strain.

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Pupa

A non-feeding and usually inactive stage in insect development which occurs between the larval and adult stages.

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Punctiform

With a depression in the center.

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Pulley

A small wheel that turns by a belt to transmit or apply power.

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Puddling

Turning the soil into a muddy or watertight paste through secondary tillage.

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Puddled soil

A soil whose structure has been mechanically destroyed, allowing the soil to run together when saturated with water. A soil that has been puddled is usually in a massive nonstructural state.

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Pubescent

Having a fuzzy surface; specifically, covered with fine soft short hairs.

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Pseudoresistance

Apparent resistance which results from transitory characters in potentially susceptible host plants. Types of pseudoresistance are host evasion, induced resistance, and escape.

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Psammophytes

Plants which prefer or tolerate sand, particularly fine to medium sand, as a habitat.

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Prune

To cut off what is not needed, such as to prune tillers so that the number of tillers in each entry is uniform.

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Protoplast fusion

An in vitro technique of producing somatic hybrids between two cultivars, species, or genera. Protoplast fusion provides the unique opportunity to exploit cytoplasmic variability in two parental lines.

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Protoplast culture

The isolation and culture of these protoplasts in nutrient medium to form callus and to regenerate plants.

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