Design and analysis of multi-site agronomic evaluation trials

Johnstone, P. D.; Lowther, W. L.; Keoghan, J.M.

doi:10.1080/00288233.1993.10417729

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…To consider the influence of soil type and the between-site variability, the research was replicated in space in accordance with Johnstone et al [40]. The trials were conducted during the 2017 growing season in three different experimental fields (hereafter referred to as location I, II and III) placed on the coastal plain of South Siracusa (36 • 49 N, 14 • 57 E, 130 m a.s.l., south-eastern Sicily, Italy), a typical area for 'early' potato cultivation in the southern Italy.…”

Section: Site Soil and Climatementioning

confidence: 99%

Productive and Physiological Response of Organic Potato Grown under Highly Calcareous Soils to Fertilization and Mycorrhization Management

et al. 2020

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The enhancement of the actual low yields is the most important challenge regarding organic farming management. In this view, a valid tool may arise by the improvement of fertilization management and efficiency. In this regard, arbuscular mycorrhizal fungi (AMF) can play an important role, especially in low fertility soils such as calcareous ones, through a better nutrient uptake and by alleviating abiotic stresses. A replicated-space experiment was carried out to investigate the role of mycorrhizal-based inoculants combined with full or halved fertilizer doses on yield and physiological traits of three early potato cultivars organically grown in highly calcareous and alkaline soils. The results indicate that AMF symbiosis ameliorated, in comparison to the not-inoculated plants, the potato tolerance to limestone stress by enhancing the potential quantum efficiency of photosystem II (Fv/F0) and plant gas-exchange parameters (photosynthesis rate and stomatal conductance). Moreover, a significant improvement of marketable yield (+25%) was observed, mainly due to an increase of the number of tubers plant−1 (+21%) and, to a lesser extent, of average tuber weight (+10%). The AMF efficiency was higher applying halved fertilizer doses and in the location where soil conditions were unfavourable for potato growth. Moreover, the qRT-PCR highlighted that AMF colonization was similar in each location, demonstrating their tolerance to limestone, alkalinity and P stresses. These findings outlined that AMF are good candidate to bio-ameliorate calcareous soils and are very useful for improving potato yields under organic farming, limiting external fertilizers supply and environmental pollution.

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Section: Site Soil and Climatementioning

confidence: 99%

Productive and Physiological Response of Organic Potato Grown under Highly Calcareous Soils to Fertilization and Mycorrhization Management

et al. 2020

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“…The responsiveness at Te Kuiti was slower than at Woodlands and the observations in the third year would suggest that the two sites are at either end of this suggested range. There is no obvious predictor of this difference in responsiveness from rainfall differences or from amongst the soil properties, including pH and Olsen P. Consequently, although it is possible to classify the RPRs into groups, it is not yet possible to predict their responses relative to SSP at particular sites.The consequences of disregarding the potential variability of responses between sites have been discussed by Johnstone et al (1993).…”

Section: Discussionmentioning

confidence: 99%

Comparison of six phosphate rocks and single superphosphate as phosphate fertilisers for clover‐based pasture

Sinclair¹,

Johnstone

Watkinson

et al. 1998

New Zealand Journal of Agricultural Research

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Six phosphate rocks (PRs), Sechura (SPR), North Carolina (NCPR), Egypt (EPR), Arad (APR), Zin (ZPR), and Nauru (NPR), were compared with single superphosphate (SSP) as annually applied P fertilisers for mown ryegrass/ white clover swards at two sites, in the central North Island (Te Kuiti) and southern South Island (Woodlands) of New Zealand over a period of three years. NPR was finely ground before application but the other PRs were applied as received and so differed considerably in particle size distribution. Measurements were made of annual dry matter (DM) production and % P in harvested herbage, and Olsen P in the soil at the end of each year. * Deceased † Author for correspondence A97042 Received 13 June 1997; accepted 9 March 1998 Overall, responses were in the order SSP>SPR~NCPR>APR~EPR~ZPR~NPR. There were important differences in responsiveness to PRs at the two sites.The agronomic performance of PRs was better related to their extractability by formic acid than to extractability by citric acid. Replacement of the standard citric acid test used in New Zealand by the formic acid test is recommended.

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“…According to Johnstone et al [35], the field trials were replicated in space in order to evaluate the influence of the soil type and the between-site variability. Field-experiments were carried out during the 2017 growing season in two different locations (hereafter indicated as location I and II) sited on the coastal plain of Siracusa (36 m a.s.l.…”

Section: Site Soil and Climatementioning

confidence: 99%

Mycorrhizal Inoculation Improves Mineral Content of Organic Potatoes Grown under Calcareous Soil

et al. 2021

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Soil mycorrhization can play an important role for the qualitative improvement of organically grown “early” potato tubers especially in low fertility soils (such as calcareous ones), by ameliorating plant uptake of limiting mineral nutrients in the soil. Hence, the objective of the present research was to elucidate the impact of soil mycorrhization on the tuber minerals content of three potato cultivars organically grown in two locations with different soil characteristics. Our data revealed the keyrole of soil mycorrhization on the tuber accumulation of Na, Cu, Mn, and P and on reducing the Na/K ratio, although the effects of soil mycorrhization were cultivar- and location-dependent. Accordingly, soil mycorrhization was able to enhance the levels of K and Ca in ‘Arizona’ and that of Mn in ‘Universa’, while it increased the Zn amount in all the cultivars under study. Additionally, soil mycorrhization significantly improved the levels of Cu and Mn in tubers in the location characterized by an initial higher soil level of these micro-minerals. This work highlighted the possibility to fortify organic early potato tubers, in terms of macro- and micro-mineral elements, by applying an eco-sustainable tool such as soil mycorrhization, provided that specific consideration is given to cultivar choice and soil characteristics.

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Design and analysis of multi-site agronomic evaluation trials

Cited by 5 publications

References 9 publications

Productive and Physiological Response of Organic Potato Grown under Highly Calcareous Soils to Fertilization and Mycorrhization Management

Productive and Physiological Response of Organic Potato Grown under Highly Calcareous Soils to Fertilization and Mycorrhization Management

Comparison of six phosphate rocks and single superphosphate as phosphate fertilisers for clover‐based pasture

Mycorrhizal Inoculation Improves Mineral Content of Organic Potatoes Grown under Calcareous Soil

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