tanah subur
39

Beberapa waktu lalu saya membaca sebuah tulisan di dinding Facebook teman tentang hubungan antara hara tanah dan ketersediannya. Ingatan saya langsung melayang ke masa kuliah disemester-semester awal, ketika mengambil mata kuliah Dasar-dasar Ilmu Tanah. Saya tidak begitu tertarik untuk mempelajarinya lebih jauh waktu itu. Toh, saya berpikir tanah bisa di”olah” untuk mendapatkan kesuburan yang kita inginkan dan disesuaikan dengan komoditas yang ditanam. Ternyata anggapan saya tidak semuanya salah, tapi kurang tepat, karena pada akhirnya tanah sebagai tempat tumbuh dan berkembangnya tanaman menjadi salah satu faktor terpenting dalam budidaya tanaman.

Nah, berkaitan dengan hara tanah, saya ingat sekali ada sebuah tabel hubungan pH tanah dan ketersediaan hara tanah..

Sumber: https://ucanr.edu/

Jika dilihat dari table di atas, kisaran pH tanah 6.0 – 8.0 merupakan kondisi yang paling diinginkan. Karena dalam rentang pH tersebut, ketersediaan hara terutama unsur makro sangat baik dalam tanah. Walaupun demikian, unsur mikro seperti Mangan dan Besi ketersediaannya akan sedikit pada pH 7.5 – 8.0. Dapat dikatakan, pH 6.0 – 6.5 adalah kondisi optimum.

Lalu, bagaimana dengan status unsur hara di wilayah Lampung?  Sebuah pertanyaan yang sulit. Hal ini karena luas Provinsi Lampung yang mencapai 35,376.5 km2.   Yang menarik, setelah membaca beberapa tulisan di dunia maya, saya menemukan sebuah table kesesuaian pH dan jenis tanaman.

Sumber: https://pertanian-mesuji.id/-/pentingnya-memahami-ph-tanah/

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