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Politici agricole comunitare

   

FERMA DE RAME



      Viermicultura, denumirea stiintifica a cresterii ramelor, are principalul rol de a interveni in reciclarea deseurilor si producerea ingrasamintelor organice - biohumusul. Tehnologia se bazeaza pe capacitatea taratoarelor de a se hrani cu deseuri organice care de multe ori polueaza mediul.
      Suntem siguri ca pescarii vor fi primii entuziasti in domeniu, cu toate astea viermicultura trebuie luata foarte in serios si privita ca o metoda fiabila, suta la suta ecologica, de a scapa de deseurile care pe zi ce trece sunt tot mai multe si afecteaza grav mediul inconjurator. In lume tehnologia este folosita pe scara larga in agricultura, si in special in legumicultura, unde calitatea solului este foarte importanta.
      Va redam in continuare un scurt articol al doamnei Larisa Cremeneac, din cadrul Institutului National pentru Zootehnie si Medicina Veterinara din Republica Moldova.
      “Viermicultivarea este o metoda biologica de prelucrare a deseurilor organice cu ajutorul viermiculturii (ramelor). Ea se bazeaza pe capacitatea biologica a ramelor de a folosi in calitate de hrana diverse genuri de deseuri organice din agricultura, industria alimentara, de la abatoare, industria lemnului, deseurile menajere, transformindu-le in ingrasaminte organice pretioase - biohumus (biocompost, viermicompost).
      La etapa actuala in Moldova se acumuleaza anual mai mult de 30 mln tone de deseuri organice (V.Garaba, 2000).
      Un rol special apartine deseurilor acumulate in localitatile rurale,care se caracterizeaza prin continutul in ele a unei parti considerabile de substante organice extrem de pretioase pentru agricultura. In localitatile rurale o pondere mare in volumul deseurilor organice o au cele animaliere.     Din lipsa de mijloace pentru evacuarea deseurilor si necunoasterea consecintelor depozitarii lor in apropierea surselor de apa, in ograzile proprii, locuitorii de la sate contribuie la poluarea apelor freatice si a solurilor cu compusi ai azotului (nitriti, nitrati, nitozoamine si amoniac), bacterii patogene si alte toxine.
      In legatura cu aceasta este necesar de mentionat ca prelucrarea deseurilor organice menajere, din agricultura si din diverse ramuri ale industriei, este o problema actuala si de perspectiva.
      Una dintre caile de solutionare a acestei probleme este viermicultura, care este un bun transformator al deseurilor organice in biohumus. In calitate de transformator al deseurilor organice serveste rama, Hibridul rosu de California, care foloseste in procesul de nutritie diverse genuri de deseuri organice, care au trecut etapele procesului de fermentare. Durata perioadei de fermentare depinde de tipurile dejectiilor folosite in calitate de substrat nutritiv pentru rame. Pentru dejectiile vitelor mari cornute perioada de fermentare alcatuieste 5 - 7 luni, cailor - 5 - 6, ovinelor - 3 - 4, porcinelor - 10 - 11, pasarilor - 14 - 16 luni.
      Dejectiile iepurilor pot fi folosite in calitate de substrat nutritiv imediat dupa colectare, fiind supuse stropirii abundente, in caz daca contin o cantitate sporita de urina. Un substrat excelent pentru rame este cel care contine celuloza. In calitate de celuloza pot servi paiele, deseurile vegetale si rumegusul din lemn (cu exceptia celui obtinut din lemnul speciilor de conifere). Aceste adaosuri sunt amestecate cu dejectiile in proportie de 1:3 si sunt supuse procesului de fermentare pentru a regla nivelul aciditatii active si continutului de azot amoniacal. Activitatea vitala a ramelor este asigurata de anumite conditii ale substratului nutritiv (temperatura, aciditare, umiditate, cantitatea azotului amoniacal).
      Temperatura optima pentru prelucrarea normala a substratului nutritiv de catre rame constituie + 20… + 25 grade. La temperatura de + 14… +18 grade are loc oprimarea activitatii de reproducere, iar la +7… + 12 grade ramele nu se inmultesc, iar la temperaturi mai scazute ele cad in hibernare. Cresterea sau scaderea esentiala a temperaturii influenteaza negativ atat asupra reproducerii cat si asupra gradului de prelucrare a deseurilor organice. O importanta deosedita pentru activitatea normala a ramelor are umiditatea substratului nutritiv, care trebuie sa constituie 70 - 80 % (adica, atunci cand se strange in pumn, apa sa curga printre degete). Micsorarea nivelului umiditatii conduce la scaderea greutatii corporale si activitatii de prelucrare a substratului.
       O alta conditie, care influenteaza procesul de prelucrare a deseurilor organice, este mentinerea aciditatii active (pH), care trebuie sa constituie 7 - 8 unitati. Devierea aciditatii active a substratului nutritiv cu o unitate de la cea optima nu provoaca schimbari esentiale, in modul de viata si activitate a ramei.
       Sporirea aciditatii pana la 5 - 6 unitati si lipsa aeratiei in substratul nutritiv conduce la micsorarea numarului de indivizi tineri si a greutatii corporale a ramelor mature.
       Pentru a regla nivelul aciditatii active a substratului nutritiv pina la nivelul optim se recomanda la cel cu mediu acid de adaugat creta sau var, iar la cel bazic - sol cu aciditatea marita sau turba. Cantitatea de azot amoniacal, dupa ce s-a terminat procesul de fermentare, trebuie sa oscileze de la 4,0 pina la 17,0 mg/kg.

       Tehnologia virmicultivarii nu este un proces copmlicat, daca se iau in consideratie conditiile expuse mai sus. In procesul viermicultivarii trebuie sa se respecte urmatoarele etape:

a) pregatirea substratului nutritiv;
b) formarea parcelelor, lojelor, sectoarelor, gramezilor;
c) plasarea in substrat a ramelor si transferarea lor pe parcursul procesului bioconversiei in sectoare noi;
d) colectarea biohumusului si pregatirea lui pentru utilizare sau pastrare.

Citeste articolul integral pe site-ul Recolta.eu


Data adaugarii: 10.12.2008 Sursa Recolta.eu
   
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