- 行业: Agriculture
- Number of terms: 29629
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1). The ridge connecting the two ends of an anatropous ovule. 2). A seamlike joining of the two lateral halves of an organ, as in the ridge of tissue along the side of an ovule, which indicates the position of the vascular bundles supplying the developing seed.
Industry:Agriculture
An experimental design in which the experimental area is divided into blocks and all of the treatments are randomly arranged within each block.
Industry:Agriculture
A process of allocating treatments to the experimental units so that each experimental unit has an equal chance of receiving any of the treatments. It is a necessary condition for obtaining a valid estimate of the experimental error. Location of treatments by chance so as to provide unbiased estimates of treatment means and experimental error.
Industry:Agriculture
A sample selected according to some chance mechanism such that every unit in the population has a known probability of being in the sample. These samples are obtained by using a random mechanism such as drawing of lots or using a table of random numbers.
Industry:Agriculture
Rice grown on leveled bunded fields to allow an accumulation of flood water on the surface during heavy rains. Grown in areas that depend entirely on rain for moisture for its water supply.
Industry:Agriculture
Bunded fields where water depth does not exceed 50 cm for more than 10 consecutive days and the fields are inundated for at least part of the season. Such fields have no access to an irrigation system, but may have on-farm rainwater conservation facilities.
Industry:Agriculture
An unirrigated field surrounded by levees and depending on rainfall for moisture supply.
Industry:Agriculture
A viral disease of rice transmitted by the brown planthopper Nilaparvata lugens. The diseased plants are characterized by the presence of ragged and twisted leaves, vein swellings, and nodal branches. There is delay in flowering and incomplete emergence of panicles; the panicles bear mostly unfilled grains.
Industry:Agriculture
