1. Tgl 19 09 2011 jam 6.26<br />1<br />http://mursitoledi.multiply.com/journal/item/1/jurnalilmu_kesuburan_tanah<br />2<br />http://www.batan.go.id/ptbn/php/pdf-publikasi/jurnal_digital/Vol5-no1/_No%205_%20Hadi.pdf<br />3<br />http://puslit2.petra.ac.id/ejournal/index.php/rkl/article/viewFile/17294/17241<br />4<br />http://eprints.undip.ac.id/2820/1/jurnal.pdf<br />5<br />http://puslit2.petra.ac.id/ejournal/index.php/rkl/article/viewFile/17294/17241<br />6<br />http://puslit2.petra.ac.id/ejournal/index.php/rkl/article/viewFile/17294/17241<br />