sexta-feira, 6 de março de 2009

Adubos Verdes

Adubos verdes são plantas utilizadas na agricultura para melhorar as condições físicas, químicas e biológicas do solo, tornando também o solo mais fértil.
Estas espécies são capazes de se associar a bactérias que se encontram no solo e transformar o nitrogénio do ar em compostos nitrogenados.

Estas plantas devem ser fragmentadas e deixadas/eterradas no solo, antes de possuirem sementes. Caso contrário tornar-se-iam invasoras.

O uso de adubos verdes pode reduzir ou anular o uso de fertilizantes minerais nitrogenados, contribuindo assim para uma maior sustentabilidade da agricultura e garantindo a conservação de recursos naturais. Para além disso, acabam por sair mais baratos para o agricultor.


Outros benefícios:

- Aumento da capacidade de armazenamento de água no solo;
- Descompactação, estruturação e aeração do solo;
- Diminuição de amplitude da variação térmica diuturna do solo;
- Proteção contra o vento e radiação solar;
- Proteção do solo contra os agentes da erosão e radiação solar;
- Rápida cobertura do solo e grande produção de massa verde em curto espaço de tempo;
- Reciclagem de nutrientes lixiviados em profundidade;
- Recuperação de solos de baixa fertilidade;
- Redução da infestação de ervas daninhas, incidência de pragas e patógenos nas culturas.

1 comentário:

Anónimo disse...


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Case of affray of Shanghai of another name for Yunnan Province of sport net dispatch had a result already, but medium doubtful point does not have the case to come on stage and be solved of the result one by one as punishment. It is reported, outside the video tape that offers besides Yunnan respect, basket assist do not have other evidence again, the witness that goes to even them Beijing please even also does not have the whole process that can prove a case.
The witness did not see fight process
I see they wanted to fight at that time, run in field to make ensure public security rapidly. On the spot the memory of technical assistant statistician of the match says, but security personnel assembles even, wait for me to hurried back again when look, had ended, so, I did not see fight process.
Witness 2 do not know who starts work first
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Apparent, the allegation of two witnesses cannot confirm whether to produce group of hit, fight to also cannot prove repeatedly even. Nevertheless, as we have learned, basket assist searching breach in wherefrom bottle mineral water, search the pretext that causes disturbance, will make processing kill with this. (Lei Ou)