Effects of Dolomite and Phosphorus Fertilizer on P Availability and Rice Growth in Sipramin Affected Fields

Qonita Mumtazia Kamilah; Wanti Mindari; Fitri Wijayanti; Daljit Singh Karam; M. Ghufron Chakim

doi:10.20527/actasolum.v4i2.3591

Authors

Qonita Mumtazia Kamilah Universitas Pembangunan Nasional Veteran Jawa Timur https://orcid.org/0009-0004-1628-6215
Wanti Mindari Universitas Pembangunan Nasional Veteran Jawa Timur https://orcid.org/0000-0002-3006-1133
Fitri Wijayanti Universitas Pembangunan Nasional Veteran Jawa Timur https://orcid.org/0000-0001-5708-2105
Daljit Singh Karam Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia https://orcid.org/0000-0002-0293-9543
M. Ghufron Chakim Universitas Pembangunan Nasional Veteran Jawa Timur https://orcid.org/0009-0001-0847-4468

DOI:

https://doi.org/10.20527/actasolum.v4i2.3591

Keywords:

Dolomite, Fertilizer, Phosphorus availability, Rice growth, Sipramin

Abstract

Long-term use of Sipramin on rice fields can cause sodium accumulation, which negatively affects soil structure and nutrient availability, particularly phosphorus. This study aims to examine the effect of dolomite and phosphorus fertilizer application on phosphorus availability and rice plant growth in rice fields affected by Sipramin. The study was conducted from February to July 2025 using a completely randomized factorial design with two factors. The first factor was the number of dolomite doses: D0 (0 tons ha^-1), D1 (1.5 tons ha^-1), D2 (2 tons ha^-1), and D3 (3 tons ha^-1). The second factor consisted of five types of phosphorus fertilizers: P0 (no phosphorus fertilizer), P1 (NPK Phonska), P2 (SP-36), P3 (MKP), and P4 (MAP). This study used a completely randomized design (CRD) factorial (4 × 5) with three replications. The results showed that dolomite application significantly increased soil phosphorus availability, with the highest value observed in D3 (34.28 ppm) at 42 days after treatment (DAT). Phosphorus fertilizers with high P content, such as MAP and MKP, provided the best response in increasing available P. Dolomite application also significantly affected plant height during early vegetative stages (14 and 35 days after treatment). However, higher doses tended to reduce the number of tillers. For plant growth, a dolomite dose of 1.5 tons ha^-1, combined with phosphorus fertilizer, resulted in optimal performance. Thus, the optimal dolomite dose varied with the observed parameter, with 3 tons ha-1 most effective for increasing soil phosphorus availability and 1.5 tons ha^-1 for supporting optimal rice growth.

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