The Effects of Fly Ash and Cow Manure on Water Spinach Grown on An Ultisol of Lampung, Indonesia

Abstract

Fly ash is the residue of coal combustion that can potentially be an ameliorant. Unfortunately, its use is limited by government regulations that are classified as hazardous and toxic materials. This study examines the effectiveness of fly ash and cow manure as an ameliorant for Ultisols. The experiment was carried out by two factors, i.e., the dose of fly ash, namely 0, 50, 100, and 150 t/ha, and the quantity of cow manure, i.e., 10, 20, and 30 t/ha. The results show that fly ash and cow manure could be ameliorants for low-pH soils such as Ultisols. The suitable dose of fly ash and cow manure as ameliorants in this study are 50 t/ha and 20 t/ha, respectively. Increasing the amount of fly ash caused a decrease in the growth of water spinach, plant height, number of leaves, fresh plant weight, root length, and dry weight of the root. In addition, fly ash increased pH 6.66-7.30, total P 31.74-52.21 mg/100 g, and total K 16.19-25.75 mg/100 g.

Respons Kubis Bunga (Brassica oleracea var. botritys L) terhadap Jenis Pupuk Organik Cair Pada Berbagai Media Tanam

“…Hal ini diduga karena berbagai media tanam (tanah: pupuk kandang: sekam padi bakar) 1:2:1 memiliki kandungan pupuk kandang yang lebih banyak, sehingga bahan organik berasal dari pupuk kandang ini dapat memperbaiki struktur tanah dan meningkatkan kapasitas menahan air. Hal ini sejalan dengan Afandi (2019); Priyadi et al, (2023) menyatakan bahwa pemberian pupuk kandang sapi pada tanah berperan untuk memperbaiki struktur tanah sehingga aerasi udara dan pergerakan air lancar, dengan demikian dapat menambah daya serap air dalam tanah dan mampu meningkatkan pertumbuhan dan produksi tanaman.…”