A combination of biological activity and the nitrate form of nitrogen can be used to ameliorate subsurface soil acidity under dryland wheat farming

Immobilisation of fertiliser nitrogen (N) by soil microorganisms can reduce N availability to crops, decreasing growth and yield. To date, few studies have focussed on the effect of different plant species on immobilisation of fertiliser N. Canola (Brassica napus) is known to influence the soil microbiome and increase mineral N in soil for future crops compared with cereals. We tested the hypothesis that canola can reduce immobilisation of fertiliser N by influencing the composition of the rhizosphere microbiome. To investigate this, we conducted a glasshouse soil column experiment comparing N fertiliser uptake between canola and wheat (Triticum aestivium) and partitioning of fertiliser N between plants and microorganisms. Plants were grown in soil to which high C:N ratio wheat residues and 15N-labelled urea fertiliser were applied. There was no difference between wheat and canola in fertiliser N uptake despite differences in fungal community composition and the carbon metabolising enzyme alpha-glucosidase in the rhizosphere. Canola obtained more soil-derived N than wheat. There was no significant difference in the rhizosphere bacterial communities present between wheat and canola and unplanted controls. Our results highlight the capacity of canola to increase mineralisation of soil N compared with wheat although the study could not describe the microbial community which facilitated this increase.

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“…The percentage of applied 15 N fertiliser uptake by plants (uptake, %) was calculated using the following formula [23]:…”

Section: Plant Sampling and Analysismentioning

confidence: 99%

Nitrogen Fertiliser Immobilisation and Uptake in the Rhizospheres of Wheat and Canola

et al. 2021

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“…Hubungan antara jenis tanaman semusim dan variasi sifat kimia tanah pada sitem agroforestri juga telah dibuktikan oleh beragam penelitian terdahulu. Studi yang dilakukan oleh Conyers, et al (2011) melaporkan bahwa tanaman semusim dengan sistem perakaran dalam dapat mengurangi kemasaman tanah karena kemampuannya dalam mencegah proses pelindihan nitrat. Studi lain oleh Butterfly, et al (2013) menemukan bahwa tanaman semusim seperti jagung dapat meningkatkan pH tanah karena seresah daun dan batang yang telah dipanen mengandung ion Ca 2+ dan Mg 2+ dalam konsentrasi tinggi.…”

Section: Tabel 2 Hasil Analisis Sifat Kimia Tanahunclassified

Variasi Sifat Kimia Tanah Pada Sistem Agroforestri di Kawasan Hutan Tanaman Kayu Putih

Sadono

Soeprijadi²,

Wirabuana³

2019

J. Ilmu Lingk.

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Sifat kimia tanah berperan penting dalam mendukung pertumbuhan dan perkembangan tanaman. Sifat kimia tanah dipengaruhi oleh tipe penggunaan lahan dan jenis vegetasi di atasnya. Perbedaan sifat kimia tanah dapat berpengaruh terhadap laju pertumbuhan tanaman sehingga menghasilkan variasi tingkat produktivitas. Penelitian ini mengkaji variasi sifat kimia tanah sebagai dampak pengembangan sistem agroforestri di hutan tanaman kayu putih. Lokasi penelitian terletak di Resort Pengelolaan Hutan Gubugrubuh, Kabupaten Gunungkidul. Sampel tanah dikumpulkan dari 3 petak yang menjadi prioritas penanaman kayu putih yaitu petak 75, petak 78, dan petak 80. Sampel tanah diambil dari lapisan permukaan pada kedalaman 0-15 cm. Indikator sifat kimia tanah yang diuji meliputi pH tanah, C-organik, N-total, P-tersedia, K-total, dan kapasitas pertukaran kation (KPK). Perbandingan sifat kimia tanah dari setiap petak dianalisis menggunakan metode One Way ANOVA (α=0,05) dan dilanjutkan HSD Tukey (α=0,05). Hasil penelitian menunjukkan kemasaman tanah pada setiap petak termasuk kategori agak masam dengan pH 6,00-6,50. Kandungan C-organik bervariasi antara 1,67-3,30%. Nilai N-total berkisar antara 0,13-0,18% sedangkan P-tersedia mencapai 1,50-6,50 ppm. Kadar K-total dan KPK termasuk kategori rendah dengan rentang nilai masing-masing 0,07-0,38 cmolc/kg dan 6,89-13,66 cmolc/kg. Penelitian ini menemukan bahwa N-total merupakan parameter sifat kimia tanah yang berbeda secara signifikan dari setiap petak (p<0,05).

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“…However, there is a limited number of studies on the effectiveness of NO 3 − on ameliorating subsoil acidity. The results of field (Conyers et al, 2011; Tang, Conyers, Nuruzzaman, Poile, & Liu, 2011) and controlled environment studies (Masud, Guo, Li, & Xu, 2014; Weligama et al, 2008) showed that addition of 60–200 kg NO 3 − ‐N ha −1 increased soil pH in the rhizosphere and bulk soil in the amended depths. In a Ultisol, only rhizosphere soil pH was increased by 0.2–0.4 units with calcium nitrate at 100 and 200 mg N kg −1 (Masud et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, root function must not be impaired, nor plant growth limited by low nutrient availability, which may occur in acid subsoils. This approach will work on moderate acid soils with low Al 3+ toxicity and pH buffer capacity, together with the use of aluminium (Al)‐tolerant crop species (Conyers et al, 2011). The impact of the initial soil pH may be subject to crop species and soil nutrients.…”

Section: Introductionmentioning

confidence: 99%

Application of calcium nitrate with phosphorus promotes rhizosphere alkalization in acid subsoil

Weng

Sale

Tang

2021

European J Soil Science

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Combatting subsoil acidity is a challenge as the incorporation of lime in subsurface layers may not be economically feasible. The use of nitrate to facilitate plant excess anion uptake has shown the potential to increase soil pH. A column experiment was carried out to demonstrate this root‐induced alkalization in various depths in an acid soil with pH 4.28 (0.01 M CaCl2). It consisted of two types of nitrogen (N) fertilizers (urea and Ca(NO3)2, both at 5 atom% 15N enrichment) banded at a depth of 0–10 cm, 10–20 cm or 20–30 cm, with phosphorus (P) fertilizer (NaH2PO4) at 150 mg P per column either applied to the N layers (N+P) or evenly mixed into the remaining layers without N addition (N‐P). Aluminium‐tolerant wheat (ET8) was used as test plants, receiving an initial N dose of 60 mg kg−1 soil at sowing and an additional dose of 30 mg kg−1 every 10 days from 40 days after sowing. Plants had a total N supply of 90 mg N kg−1 at 50 days and 180 mg N kg−1 at 80 days after sowing. The N+P treatments increased plant N uptake and increased rhizosphere and bulk soil pH. Nitrate placement increased pH of treated layers by up to 0.4 and 0.2 units in the rhizosphere and bulk soils, respectively, compared with the control at Day 80. Rhizosphere alkalization was greater with deeper N+P treatments as these encouraged the proliferation of deeper roots in the treated layer. The form of N and the application method of P fertilizer had no effect on shoot biomass over 80 days of growth. The N+P treatments had 7% higher 15N recovery of fertilizer in plants than the N‐P treatments. The current study also showed that P fertilizer enhanced rhizosphere alkalization induced by calcium nitrate. The results suggest that the use of nitrate fertilizer with P treatments can facilitate alkalization of acid subsoils. Highlights Phosphorus facilitates amelioration of subsurface soil acidity with nitrate fertilizer Placement of nitrate induces alkalization of acid soil at various depths Combined addition of nitrate and P at depth enhances nitrate uptake by wheat Balanced nutrient supply enhances excess anion uptake and rhizosphere alkalization

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A combination of biological activity and the nitrate form of nitrogen can be used to ameliorate subsurface soil acidity under dryland wheat farming

Cited by 23 publications

References 16 publications

Nitrogen Fertiliser Immobilisation and Uptake in the Rhizospheres of Wheat and Canola

Nitrogen Fertiliser Immobilisation and Uptake in the Rhizospheres of Wheat and Canola

Variasi Sifat Kimia Tanah Pada Sistem Agroforestri di Kawasan Hutan Tanaman Kayu Putih

Application of calcium nitrate with phosphorus promotes rhizosphere alkalization in acid subsoil

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