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Hypogeal germination (from Ancient Greek ὑπόγειος [hupógeios] 'below ground', from ὑπό [hupó] 'below' and γῆ [gê] 'earth, ground') is a botanical term indicating that the germination of a plant takes place below the ground. An example of a plant with hypogeal germination is the pea (Pisum sativum).
Sowing is the process of planting seeds. An area that has had seeds planted in it will be described as a sowed or sown area. When sowing it is important to: Use quality seeds; Maintain proper distance between seeds; Plant at correct depth; Ensure the soil is clean , healthy , and free of pathogens (disease causing microorganisms)
The stages of germination of a pea plant: A. seed coat, B. radicle, C. primary root, D. secondary root, E. cotyledon, F. plumule, G. leaf, H. tap root. The part of the plant that first emerges from the seed is the embryonic root, termed the radicle or primary root. It allows the seedling to become anchored in the ground and start absorbing water.
It is easily identifiable by the large, bright orange to red papery calyx covering over its fruit, which resembles paper lanterns.It is a perennial herbaceous plant growing to 40–60 cm (16–24 in) tall, with spirally arranged leaves 6–12 cm (2.4–4.7 in) long and 4–9 cm (1.6–3.5 in) broad.
In botany, a seed is described as showing hypogeal germination when the cotyledons of the germinating seed remain non-photosynthetic, inside the seed shell, and below ground. [2] The converse, where the cotyledons expand, throw off the seed shell and become photosynthetic above the ground, is epigeal germination .
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A double graft union of diamante citron upon sour orange rootstock. Sour orange: the only rootstock that truly is an orange (the Citrus × aurantium or bitter orange). It is vigorous and highly drought-resistant. Poncirus trifoliata: a close relative of the genus Citrus, sometimes classified as Citrus trifoliata.
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