Measuring potassium fractions is not sufficient to assess the long-term impact of fertilization and manuring on soil’s potassium supplying capacity

Das, Debarup; Nayak, A. K.; Thilagam, V. Kasthuri; Chatterjee, Dibyendu; Shahid, Mohammad; Tripathi, Rahul; Mohanty, SK; Kumar, Anjani; Lal, B.; Gautam, Priyanka; Panda, B.B.; Biswas, Sunanda

doi:10.1007/s11368-018-1922-6

Cited by 30 publications

(21 citation statements)

References 26 publications

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“…Compared to initial value, the Kex was decreased in control and treatment receiving only the nitrogen and phosphorus N+P 2 O 5 +K 2 O-60+30+0 mg kg -1 . Similar observation was made by Das et al (2018). The Non-Exchangeable potassium (Knx) was highest under treatment of NPK-60:30:50 mg kg -1 (5.41, 5.32 and 5.23 mg kg -1 ), closely followed by the treatment supplied NPK-60:30:40 mg kg -1 .…”

supporting

confidence: 83%

Effect of potassium levels on its fractions in soil under rice (Oryza sativa L.) cultivation

Ranjan¹

2021

APSR

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supporting

confidence: 83%

Effect of potassium levels on its fractions in soil under rice (Oryza sativa L.) cultivation

Ranjan¹

2021

APSR

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“…(2019) reported that rice yield increases to preplant‐K fertilization were somewhat unpredictable on soils that were interpreted as having a low level of available‐soil K. Previous research by Das et al. (2018) also showed that soil K fractions were not sufficient to assess the long‐term effect of fertilization and manuring on soil's K supplying capacity for rice. However, Fryer et al.…”

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confidence: 99%

Determination of critical Y‐leaf potassium concentrations in pure‐line and hybrid rice

Gruener

Drescher

Slaton

et al. 2022

Agrosystems Geosci & Env

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Potassium (K) deficiency symptoms of rice (Oryza sativa L.) are difficult to visually diagnose during reproductive growth. Critical tissue–K concentrations may change across time and within cultivars. Our goal was to evaluate rice yield response to K fertilization and define continuous critical Y‐leaf–K concentrations (YLKC) for the production of ≥95% relative yield in pure‐line and hybrid rice. Ten Y‐leaves (uppermost leaf with a fully developed collar) were collected weekly during rice reproductive growth from selected fertilizer‐K rates (0–150 kg K ha–1) in 13 trials with variable soil‐test K (32–164 mg kg–1). Trials were seeded either with a pure‐line (8) or hybrid (5) cultivar. Significant yield increases from K fertilization occurred in 38% of the trials. Pure‐line cultivars were responsive to K fertilization and rice without fertilizer‐K produced 66–90% of maximum yield produced by fertilized treatments (8,506–11,153 kg ha–1). Hybrid rice receiving no fertilizer‐K produced 96–99% of maximum yield (9,067–12,572 kg ha–1) regardless of soil‐test K. The YLKC increased with increasing fertilizer‐K rate and declined across time for K‐sufficient rice or remained relatively constant across time for rice marginally sufficient or deficient in K. Rice YLKC above 16.0 g K kg–1 between R1 and R2 maximizes pure‐line cultivars yield production. The critical YLKC declined to about 13.0 g K kg–1 between R2 and R3 but was less accurate for diagnosing K deficiency than samples collected before R2. The YLKC can be used to assess pure‐line cultivars’ K nutritional status between the R1 and R2 stages.

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“…According to Hasan (2002), in terms of available or ammonium acetate extractable K (NH 4 OAc-K) among 9 districts studied in Assam, 7 districts were found to be low in available K and the other 2 districts were medium in available K. In Indian agriculture K application is largely neglected. Such low or negligible K-fertilization causes low nutrient use efficiencies and imbalance of N:P:K in the plants (Wang et al 2007a, b, Singh et al 2012, and over long periods of time adversely affects a soil's K-fertility status (Das et al 2018). There is a general belief that Indian soils are rich in K and may not require external application of K, causing overdependence on soils native-K (Sanyal 2014).…”

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Assessment of potassium status in soils under different land use systems of Assam

et al. 2019

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The knowledge on contribution of potassium (K) from different pools become pertinent for evaluating soil fertility status and providing better interpretation in near future. The present study aims to assess the soil K pools under major land use systems of Assam, viz. mulberry, sugarcane, tea and rice-mustard under three depths (0-15, 15-30 and 30- 60 cm) and categories them, based on the content of exchangeable K (Exch-K) and non-exchangeable K (NEK). In 0-15 cm soil depth, Exch-K content was highest in the rice-mustard land use system (49.7 mg/kg) whereas, NEK content were highest in the mulberry land use system (1351 mg/kg). Both Exch-K and NEK content were found to be highest under mulberry system at 15-30 and 30-60 cm depth. Mulberry and rice-mustard land use systems had higher amounts of NEK but lower in available K, thereby, need maintenance dose of K. The NEK pools were included along with Exch-K in categorising soils into nine groups for evolving better strategies to manage soil K fertility. Results revealed that most of the soils were in category with low Exch-K and NEK content. Irrespective of depths, soils from nine sites were low in both Exch-K and NEK. The third category soils with low Exch-K and high NEK had the second highest number of soils in all the depths.Thus, soils having low levels of both Exch-K and NEK, the K must be applied immediately to sustain crop productivity under different land use systems.

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Measuring potassium fractions is not sufficient to assess the long-term impact of fertilization and manuring on soil’s potassium supplying capacity

Cited by 30 publications

References 26 publications

Effect of potassium levels on its fractions in soil under rice (Oryza sativa L.) cultivation

Effect of potassium levels on its fractions in soil under rice (Oryza sativa L.) cultivation

Determination of critical Y‐leaf potassium concentrations in pure‐line and hybrid rice

Assessment of potassium status in soils under different land use systems of Assam

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