Doses de aplicação de nitrogênio e potássio em relação à podridão parda e sarna em ameixeira 'Reubennel' na região de Araucária, Paraná

Mio, Louise Larissa May De; Tutida, Inês; Motta, Antonio; Dolinski, Marcos Antonio; Serrat, Beatriz Monte; Monteguti, Denise

doi:10.1590/s1982-56762008000100006

Cited by 2 publications

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“…State standards may lead to N over-fertilization and nitrate leaching in 'Esmeralda' orchards, and it could have potential impact on water quality [28,29]. Excessive vegetative growth has impact on fruit yield and quality [23,25], as well as the incidence of fungal diseases due to decreased air circulation within the canopy [72]. When N addition exceeds its demand by peach trees, vegetative growth is stimulated and it limits sunlight dispersion throughout the canopy [23,35].…”

Section: Foliar Nutrientsmentioning

confidence: 99%

Esmeralda Peach (Prunus persica) Fruit Yield and Quality Response to Nitrogen Fertilization

Nava

Júnior

Parent

et al. 2022

Plants

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‘Esmeralda’ is an orange fleshed peach cultivar primarily used for juice extraction and secondarily used for the fresh fruit market. Fruit yield and quality depend on several local environmental and managerial factors, mainly on nitrogen, which must be balanced with other nutrients. Similar to other perennial crops, peach trees show carryover effects of carbohydrates and nutrients and of nutrients stored in their tissues. The aims of the present study are (i) to identify the major sources of seasonal variability in fruit yield and qu Fruit Tree Department of Federal University of Pelotas (UFPEL), Pelotas 96010610ality; and (ii) to establish the N dose and the internal nutrient balance to reach high fruit yield and quality. The experiment was conducted from 2014 to 2017 in Southern Brazil and it followed five N treatments (0, 40, 80, 120 and 160 kg N ha−1 year−1). Foliar compositions were centered log-ratio (clr) transformed in order to account for multiple nutrient interactions and allow computing distances between compositions. Based on the feature ranking, chilling hours, degree-days and rainfall were the most influential features. Machine learning models k-nearest neighbors (KNN) and stochastic gradient decent (SGD) performed well on yield and quality indices, and reached accuracy from 0.75 to 1.00. In 2014, fruit production did not respond to added N, and it indicated the carryover effects of previously stored carbohydrates and nutrients. The plant had a quadratic response (p < 0.05) to N addition in 2015 and 2016, which reached maximum yield of 80 kg N ha−1. In 2017, harvest was a failure due to the chilling hours (198 h) and the relatively small number of fruits per tree. Fruit yield and antioxidant content increased abruptly when foliar clrCu was >−5.410. The higher foliar P linearly decreased total titratable acidity and increased pulp firmness when clrP > 0.556. Foliar N concentration range was narrow at high fruit yield and quality. The present results have emphasized the need of accounting for carryover effects, nutrient interactions and local factors in order to predict peach yield and nutrient dosage.

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Section: Foliar Nutrientsmentioning

confidence: 99%

Esmeralda Peach (Prunus persica) Fruit Yield and Quality Response to Nitrogen Fertilization

Nava

Júnior

Parent

et al. 2022

Plants

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“…Pada tanaman, K berperan pada berbagai proses biokimia dan fisiologi tanaman seperti fotosintesis, aktivasi enzim, sintesis protein, regulasi osmotik, pergerakan stomata, transport floem, mengatur keseimbangan kation-anion dalam tanaman, dan ketahanan tanaman terhadap stres biotik maupun abiotik (Walters dan Bingham 2007;Wang et al 2013). Hubungan positif antara insidensi penyakit dengan K tersedia dalam tanah telah dilaporkan oleh banyak peneliti di antaranya, yaitu May- De-Mio et al (2008) pada tanaman plum terhadap Monilinia fructicola, Nam et al (2016) pada tanaman stroberi terhadap C. gloeosporioides, dan Davis et al (2018) pada tanaman gandum terhadap Blumeria graminis. Mekanisme meningkatnya ketahanan tanaman terhadap suatu penyebab penyakit karena kekurangan K diduga terjadi oleh adanya peningkatan ROS (Ashley et al 2006;Amtmann et al 2008;Troufflard et al 2010).…”

Section: Pembahasanunclassified

Untitled

2020

J Fitopatol Indones

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Penyakit busuk akar dan pangkal batang (BAPB) tebu merupakan penyakit baru yang saat ini muncul menjadi masalah di perkebunan tebu di Lampung dan Sumatera Selatan. Penelitian bertujuan mengetahui model perkembangan penyakit, AUDPC, laju infeksi (r), dan pengaruh anasir cuaca dan kondisi tanah (sifat fisika dan kimia tanah) pada perkembangan penyakit busuk akar dan pangkal batang tebu di Sumatera Selatan. Pengamatan penyakit BAPB dilakukan pada tiga varietas tebu yang berbeda pada lahan yang tahun sebelumnya terdapat serangan penyebab penyakit. Pengamatan insidensi penyakit diamati tiap minggu selama delapan minggu. Data insidensi penyakit digunakan untuk menganalisis model perkembangan penyakit, AUDPC, dan laju infeksi penyakit BAPB tebu. Data mingguan kondisi anasir cuaca diambil dari BMKG Bandara Sultan Mahmud Badaruddin, Palembang. Sampel tanah diambil dari tiga katogeri insidensi penyakit, yaitu sehat (tidak ada serangan), sedang (insidensi penyakit 25.1%-50%), dan berat (insidensi penyakit 50.1%-75%). Hasil penelitian menunjukkan bahwa penyakit berkembang mengikuti model monomolekuler dan logistik. Nilai AUPDC dan laju infeksi (r) pada model monomolekuler lebih kecil dibandingkan dengan model logistik. Koefisien efek langsung curah hujan dan kelembaban relatif pada penyakit ialah positif (1.27 dan 0.46 berturut-turut), bertentangan dengan suhu dan durasi iradiasi yang memiliki koefisien negatif (-0.33 dan-0.45 berturut-turut). Sementara itu, K tersedia dan permeabilitas berpengaruh positif pada penyakit, sedangkan kandungan N total dan Fe tersedia berpengaruh negatif pada penyakit.

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Doses de aplicação de nitrogênio e potássio em relação à podridão parda e sarna em ameixeira 'Reubennel' na região de Araucária, Paraná

Abstract: RESUMO

Cited by 2 publications

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Esmeralda Peach (Prunus persica) Fruit Yield and Quality Response to Nitrogen Fertilization

Esmeralda Peach (Prunus persica) Fruit Yield and Quality Response to Nitrogen Fertilization

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