Sunflower nitrogen requirement and 15N fertilizer recovery in Western Pampas, Argentina

Scheiner, J; Boem, Flavio Hernán Gutiérrez; Lavado, Raúl S.

doi:10.1016/s1161-0301(01)00147-2

Cited by 58 publications

(47 citation statements)

References 10 publications

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“…Increased N rates led to declines in oil concentrations of the sunflower plants. Similar responses have been reported in other studies (Steer et al 1986, Geleta et al 1997, Scheiner et al 2002. There were no significant cultivar × year, year × nitrogen rate, and year × cultivar × nitrogen rate interactions for seed oil concentration (Table 2).…”

Section: Seed Oil Concentrationsupporting

confidence: 88%

Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

Özer¹,

Polat²,

Öztürk³

2004

Plant Soil Environ.

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N fertilization has a substantial influence on sunflower (Helianthus annuus L.) seed yield and quality. It was also well established that high-yielding sunflower hybrids had more N requirement than old cultivars such as open-pollinated ones. However, in Turkey, no sufficient information regarding the response of new developed oilseed sunflower hybrids to nitrogen fertilization under irrigated conditions. Therefore, a 2-year study was conducted to determine the effects of nitrogen application rates on the growth, yield, and yield components of two oilseed sunflower hybrids (AS-508 and Super 25) under irrigated conditions. In this study, all plant parameters were significantly influenced by applied nitrogen fertilizer rates. Yield response to nitrogen rates was positive and linear. Our research data indicated that under irrigated conditions N rate of 120 kg/ha was adequate for sunflower production in this region.

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Section: Seed Oil Concentrationsupporting

confidence: 88%

Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

Özer¹,

Polat²,

Öztürk³

2004

Plant Soil Environ.

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“…Moreover,Özgüven and Sekeroglu [16] and Shah [17] did not find any significant differences among N doses on the seed 6 Journal of Chemistry oil content of black cumin. Many studies on other oily seeds have shown that increasing the N dose resulted in reduction in seed oil content [33,[36][37][38]. On the other hand, the oil content in seeds is usually low at suboptimal K supply, as found by Sale and Campbell [31] and Sawan et al [33], because K plays a key role in fatty acid and lipid metabolism.…”

Section: Resultsmentioning

confidence: 99%

Changes in N, K, and Fatty Acid Composition of Black Cumin Seeds Affected by Nitrogen Doses under Supplemental Potassium Application

Aytaç

Gulmezoglu

Saglam

et al. 2017

Journal of Chemistry

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This study was carried out to determine the efficiency of nitrogen (N) doses (0, 30, 60, and 90 kg N ha −1 ) under supplemental potassium (K) application (50 kg K 2 O ha −1 ) on black cumin in 2011 and 2012. The results showed that increased N levels resulted in increasing seed yield and N and K contents in seed, while oil content decreased. The seed yield and oil yield were peaked at the doses of 60 kg N ha −1 and 50 kg K ha −1 . An increase in N doses caused a reduction in oil content regardless of K supply. Saturated fatty acids and oleic acid were slightly increased by K application, while minor changes in linoleic acid were detected. It was concluded that 60 kg N ha −1 with supplemental K application should be advised for enhancement in seed yield, oil yield, and N and K contents in seeds of black cumin without significant changes in fatty acid composition.

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“…Namun efisiensi pemupukan N pada tanaman umumnya sangat rendah. Scheiner et al (2002) melaporkan bahwa efisiensi pemupukan N pada tanaman bunga matahari hanya sekitar 50%. Hal ini merupakan masalah serius yang membawa konsekuensi terhadap ekonomi dan lingkungan.…”

Section: Pendahuluanunclassified

Karakterisasi dan Seleksi Beberapa Isolat Azotobacter sp. untuk Meningkatkan Perkecambahan Benih dan Pertumbuhan Tanaman

Widiastuti¹,

Siswanto²,

Suharyanto³

2016

BPN

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Characterization and Selection of Azotobacter sp. in Enhancing Seed Germination and Growth of Plant. Nitrogen (N) is a macro nutrient needed by the plant. Chemical synthesis of N fertilizer need high energy input. On the other hand, Azotobacter sp. has been known as a free living nitrogen fixing bacteria. This bacteria is also known as growth factor producing bacteria such as indole acetic acid (IAA) and extracellular polysaccharide. The ability of Azotobacter sp. in fixing N and producing IAA was affected by strain type of the bacteria as well as the origin of the isolate. It had been characterized 44 isolates of Azotobacter sp. isolated from selected dry habitat such as oil palm in Sekayu (South Sumatera), coffee and cashew nut tree in NTT, corn crops in Banjar (South of Kalimantan), and rubber tree in Bogor (West Java). Isolation was conducted using Ashby media. Based on their ability in producing IAA, promoting germination of the seed and growth of leguminous cover crops Pueraria phaseoloides. The result showed that isolate of 116(2), from Sikka, Flores, (NTT), produced highest IAA i.e 2.815 &#956;M within the third day and 4.02 uM in the sixth day incubation time. Strain D1/8B (isolated from oil palm plantation in South Sumatera) and S5 (isolated from corn in South Kalimantan) could increase 2-3 times number of germinating seed of P. phaseoloides for the third days. Azotobacter sp. isolate of D1/2, 107, and 113 in combination with 50% recomended doses of chemical fertilizer could enhance the growth of plant (fresh and dry biomassa total) of sorghum higher compared to 100% chemical fertilizer doses (control). Isolate of D1/2 originated from South of Sumatera improved germination of seed, and enhanced the growth of sorghum, while isolate of 113 from Sikka, Flores, NTT had the ability to increase the growth of sorghum during one month in glass house experiment. AbstrakNitrogen (N) merupakan unsur makro yang diperlukan oleh tanaman. Bakteri Azotobacter sp. diketahui dapat memfiksasi N secara nonsimbiotik dan menghasilkan hormon tumbuh seperti IAA dan polisakarida ekstraseluler. Kemampuan penambatan N dan produksi IAA dipengaruhi oleh galur bakteri dan asal isolat. Penelitian dilakukan untuk mengkarakterisasi 44 isolat Azotobacter sp. yang diisolasi dari beberapa habitat lahan kering, yaitu perkebunan kelapa sawit di Sekayu (Sumsel), perkebunan kopi dan jambu mete di Nusa Tenggara Timur, areal tanaman jagung di Banjar (Kalsel), dan kebun karet di Bogor (Jabar). Isolasi bakteri Azotobacter sp. dilakukan menggunakan medium Ashby. Isolat yang diperoleh diuji kemampuannya menghasilkan IAA dan pengaruhnya terhadap perkecambahan benih serta pertumbuhan kacang penutup tanah (Pueraria phaseoloides). Hasil percobaan menunjukkan bahwa isolat 116 (2) menghasilkan IAA tertinggi, yaitu 2,815 &#956;M pada hari ke-3 dan 4,02 &#956;M pada hari ke-6. Isolat tersebut berasal dari Sikka, Flores, NTT. Isolat D1/8B (asal perkebunan kelapa sawit di Sumsel) dan S5 (asal areal tanaman jagung di Kalimantan) dapat meningkatkan 2-3 kali jumlah benih P. phaseoloides yang berkecambah pada hari ke-3. Isolat D1/2, 107, dan 113 dapat meningkatkan pertumbuhan tanaman sorgum (total biomasa basah dan kering) lebih tinggi dibandingkan dengan pupuk NPK 100%. Isolat D1/2 asal Sumsel meningkatkan perkecambahan benih dan pertumbuhan sorgum relatif tinggi, sedang isolat 113 asal Sikka, Flores, NTT, mampu meningkatkan pertumbuhan tanaman sorgum.

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Sunflower nitrogen requirement and 15N fertilizer recovery in Western Pampas, Argentina

Cited by 58 publications

References 10 publications

Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

Changes in N, K, and Fatty Acid Composition of Black Cumin Seeds Affected by Nitrogen Doses under Supplemental Potassium Application

Karakterisasi dan Seleksi Beberapa Isolat Azotobacter sp. untuk Meningkatkan Perkecambahan Benih dan Pertumbuhan Tanaman

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