Aplikasi Biochar Bambu Diperkaya N dan K terhadap Pertumbuhan Vegetatif dan Kadar Hara Daun Nanas (Ananas comosus L. Merr) pada Ultisol di Lampung Tengah

Abstract

Lahan perkebunan nanas PT. Great Giant Pineapple (PT. GGP) di Lampung Tengah didominasi oleh Ultisol yang tergolong tanah marginal dengan kandungan hara dan tingkat produktivitas rendah. Aplikasi biochar bambu diperkaya N dan K, yang diformulasikan menjadi pupuk lepas terkendali, dapat dilakukan untuk mengatasi permasalahan tersebut. Penelitian ini bertujuan mengetahui pengaruh biochar bambu diperkaya N dan K terhadap pertumbuhan vegetatif dan kadar hara daun nanas pada 3 bulan setelah tanam (BST) di lahan perkebunan PT. GGP. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) faktor tunggal dengan 4 taraf perlakuan biochar bambu diperkaya N dan K, yaitu 0%, 50%, 100%, dan 150% dari dosis N dan K standar PT. GGP. Hasil penelitian menunjukkan bahwa perlakuan aplikasi biochar bambu diperkaya N dan K tidak berpengaruh nyata terhadap kadar hara daun, namun berpengaruh nyata terhadap lebar D-leaf, indeks D-leaf, dan rata-rata panjang akar nanas pada 3 BST. Hasil uji korelasi Pearson memperlihatkan hubungan positif yang signifikan antara kadar N tanah dengan kadar N daun (r = 0,431; p = 0,048).

Pineapple plantation of PT Great Giant Pineapple (PT. GGP) in Central Lampung is predominantly established on Ultisols, which are classified as marginal soils due to their low fertility and productivity. One strategy to address this limitation is the application of bamboo biochar enriched with N and K, formulated as a controlled release fertilizer. This study aimed to evaluate the effect of N- and K-enriched bamboo biochar on leaf nutrient content and vegetative growth of pineapple at 3 months after planting (MAP). The experiment was arranged in a Randomized Complete Block Design (RCBD) single factor with four treatment levels of N- and K-enriched bamboo biochar: 0%, 50%, 100%, and 150% of the standard N and K dosage of PT. GGP. The results showed that the treatment did not significantly affect leaf nutrient content at 3 MAP. However, significant increases were observed on D-leaf width, D-leaf index, and average root length. Pearson correlation analysis revealed a significant positive relationship between soil N content and leaf N content (r = 0.431, p = 0,048).