Agronomics and economics of late blight control in potato in West Java, Indonesia

Schepers, H.T.A.M.; Gunadi, N.; Brink, L. van den; Moekasan, T.K.; Prabaningrum, Laksminiwati; Karjadi, A.K.; Putter, H. de

doi:10.17660/actahortic.2018.1208.50

Cited by 5 publications

(5 citation statements)

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“…Such practices may infect tubers and induce early season late blight problems (Cooke et al 2011;Yuen et al 2008), which may explain our ndings that an early fungicide spray can be an effective measure to increase potato yield. Second, our results show that more fungicide sprays are detrimental to potato yield, which contrasts with earlier research(Schepers et al 2014a;Schepers et al 2016a). Moreover, a longer growing season with frequently spraying leads to an overall higher number of sprays.…”

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confidence: 99%

“…Due to climate conditions, late blight is one of the most prevailing diseases, especially in the rainy season (Schepers et al 2016b). Furthermore, and as in many countries with emerging economies, potato seed is one of the most costly inputs (Adiyoga et al 1999;Gunadi and Pronk 2022), and the use of farm saved seed is a common practice (Ginandjar et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Opportunities to narrow potato yield gaps and increase resource use efficiency in West Java, Indonesia

Pronk,

Gunadi,

Hermelink

et al. 2024

Preprint

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Consumer demand for potato in Indonesia increases while production stagnates. Government policy recognized this discrepancy and prioritized efforts to increase potato yields through farmer support programs with moderate effects to date. This study aimed to decompose potato yield gaps and identify agronomic yield constraints in West Java. Actual yield and management practices of 178 farm registrations over five consecutive growing seasons were analyzed with stochastic frontier analysis. The potential yield (Yp) for each registration was simulated with the LINTUL-POTATO-DSS crop model. The overall yield gap was decomposed into its efficiency, resource, and technology components. The potato yield gap was 21.5 t ha -1, corresponding to 54% of Yp. The efficiency and technology yield gaps were both ca. 10 t ha -1, corresponding to 26% of Yp, and the resource yield gap was negligible. All fields received sufficient inputs for potential production but most inputs were used inefficiently. An early first fungicide spray after emergence and frequently spraying to control late blight increased yields significantly. The seed generation planted was critical to potato yield gaps as yield decreased significantly with older generations. Some high yielding fields, however, were also planted with older generations, so other production factors contributed to the yield gap as well. Improving potato yield will require well performed late blight control, the use of high-quality seed, and improved management practices, which include reduced input rates, to reduce current yield gaps sustainably.

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confidence: 99%

Section: Introductionmentioning

confidence: 99%

Opportunities to narrow potato yield gaps and increase resource use efficiency in West Java, Indonesia

Pronk,

Gunadi,

Hermelink

et al. 2024

Preprint

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“…The solution that runs off the leaves was not effective in protecting the plants against the disease. Experiments in Garut and Pangalengan indicated that a 20% reduction in spray volume in both Atlantic and Granola tended to result in a decreased efficacy of late blight control [13]. However, the small difference in efficacy did not negatively influence potato yields.…”

Section: Resultsmentioning

confidence: 97%

“…The number of fungicide applications in Garut with either curative or preventive fungicides in Atlantic and Granola were on average 20.5 and 16.9 applications per farmer, respectively, whereas in Pangalengan the number of applications of fungicides with either curative or preventive fungicides in Atlantic and Granola were on average 15.3 and 14.4 applications per farmer, respectively. Both Atlantic and Granola are susceptible to late blight, but Atlantic is somewhat more susceptible than Granola and therefore requires a more robust control strategy under high disease pressure [13,14]. However, the most stricking from Figure 3 is that late blight conditions in the dry season are less favourable than in the rainy season and such a difference is not found in the dry season 2013 compared to the rainy season 2013, but afterwards a decrease of applications in general and particularly in dry seasons is found.…”

Section: Resultsmentioning

confidence: 99%

Identifying key factors to improve productivity and reduce environmental impact of potato farms in West Java, Indonesia

Gunadi¹,

Pronk

2023

E3S Web of Conf.

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Potato (Solanum tuberosum L.) production in Indonesia has increased significantly in recent years, with a total annual production of 1.3 million tons. Although the acreage of potatoes is increasing relatively, the productivity of potatoes remains stagnant and is relatively low, around 16-17 tons per ha. A series of studies with the objective to identify key factors associated with potato cultivation and to evaluate of existing farmers’ practices were carried out in the main potato-producing areas i.e. Pangalengan and Garut, West Java during five consecutive production seasons starting from the dry season of 2013 to the dry season of 2015. In each sub-district, ten potato farmers growing cv. Granola and/or Atlantic were selected resulting in 40 participating farmers. A substantial variation of the observed yields was found for both varieties and regions, mainly due to seed quality. The supply of nitrogen (N) and phosphate (P2O5) from organic and chemical fertilizers of 400 kg N and 581 kg P2O5/ha outreached results of local experiments in obtaining optimal yields. Farmers applied much more active ingredient (AI) per spray, up to 6 times and used more than 500 l of water per spray to control late blight, while experiments showed the spray volume can be reduced by 10-20% without loss of efficacy. The key factors identified in this study to stimulate potato development and productivity and reduce environmental impact in the areas were seed potato quality, fertilizer use efficiency and late blight control.

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“…The pathogens infection is sharply lowering potato productivity by up to 100 % [11,12]. Today, the farmers mostly apply excessive organic-chemical pesticides and fertilizers as the main strategy to control the disease.…”

Section: Introductionmentioning

confidence: 99%

Distinctive Bacteria Consortium of Rhizosphere and Surface Soil from Semi-Organic Potato Cultivation in Magelang, Indonesia

et al. 2023

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Potato cultivation in the middle land is an alternative solution to avoid pathogens. Although it reduces potato quantity and requires more chemical fertilizers to increase production that potentially damages the environment. Therefore, this study aims to characterize contaminations and indigenous microbes from semi-organic potato cultivation centers in Central Java. Soil samples from the semi-organic potato cultivation center of Kledung, Central, were analyzed for metal contamination using the atomic absorption spectrophotometry method and metagenomic soil bacterial diversity profiles. Specifically targeted genes of distinct regions 16SV3-V5. OTUs were identified using Uparse v7.0.1001, while Beta diversity analysis used UniFrac. All these indices in our samples were calculated with QIIME (Version 1.7.0) and displayed with R software (Version 2.15.3). The results showed that semi-organic cultivations had been polluted with Pb > Cd > Cr > As, and carbamate residue was detected in the rhizosphere and surface soil. Manure and compost application alongside NPK fertilizer increases N input, decreasing surface soil bacteria. The surface soil (with a depth of ≤ 5 cm) has a lower index of species richness, diversity, and relative abundance than the rhizosphere layer (depth > 5 cm). Firmicutes, Proteobacteria, and Actinobacterium dominate soil-level bacteria. In comparison, the rhizosphere soil has a higher bacteria diversity dominated by N-tethering rhizobia from the phylum Proteobacteria. The potato root attracts rhizobacteria consortium that support plant growth. A further study should be conducted to describe how the bacterial consortium formed, rhizobia migration from surface to rhizosphere soil, and its interaction with the potato plants. HIGHLIGHTS Semi-organic potato cultivation in Kledung, Temanggung, Indonesia, is contaminated with heavy metals, especially Pb, which is the highest pollutant, and the carbamate residue Excessive nitrogen (N) input from organic and chemical fertilizers reduces the diversity of soil surface bacteria Then manure application as organic fertilizer introduces pathogenic bacteria such as Eschericia-Shigella, Faecalibaculum, Fusobacteria, Bacilli, and Enterococcus The rhizosphere soil is dominated by N-fixating rhizobia from Proteobacteria, including Pseudoxanthomonas Mexicana, Lysobacteria , Devosia riboflavina, Aminobacter sp., Bosea sp., Allorhizobium, Neorhizobium, Pararhizobium, and Rhizobium GRAPHICAL ABSTRACT

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Agronomics and economics of late blight control in potato in West Java, Indonesia

Cited by 5 publications

References 1 publication

Opportunities to narrow potato yield gaps and increase resource use efficiency in West Java, Indonesia

Opportunities to narrow potato yield gaps and increase resource use efficiency in West Java, Indonesia

Identifying key factors to improve productivity and reduce environmental impact of potato farms in West Java, Indonesia

Distinctive Bacteria Consortium of Rhizosphere and Surface Soil from Semi-Organic Potato Cultivation in Magelang, Indonesia

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