The Nagoya University study headed by Takashi Yoshimura revealed that birds start singing in spring when days are longer. Their behavior was linked to a hormone called Thyrotrophin which is triggered during longer days. The process results in the expansion of the male testes in birds, which make them sing.
<span>B.leave land unplanted to gather moisture
This is the traditional practice. Today, dry planting techniques include mulching after a short rain,which stops moistures from evaporating. dry planting produces are very delicious,especially wines.
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