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| San Juan Martínez, Erwin. |
| El diagnóstico oportuno del estado nutrimental de los cultivos en la agricultura de precisión es de suma importancia y vitalidad; por lo que cada vez se hacen más necesarias técnicas que permitan conocer el estado nutrimental del cultivo de forma rápida, precisa y confiable. Es por ello que el presente trabajo tuvo como objetivo determinar la concentración de nitrógeno foliar en chile de agua mediante reflectancia, dicha característica se obtuvo por medio de equipos como: radiómetro (CROPSCAN), escáner de escritorio y cámara fotográfica digital, de igual forma se determinó un índice de verdor utilizando el medidor portátil SPAD Minolta 502 y, la concentración de nitrógeno foliar por el método Kjeldahl. A partir de esas mediciones y con el programa Curve... |
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Palavras-chave: Agricultura de precisión; Firmas espectrales; Nutriente; Precision agriculture; Spectral signatures; Nitrogen content; Edafología; Maestría. |
| Ano: 2014 |
URL: http://hdl.handle.net/10521/2285 |
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| 申, 宝明; 佐藤, 禎稔; 加藤, 拓; 谷, 昌幸; 岸本, 正; SHEN, Baoming; SATOW, Tadatoshi; KATO, Taku; TANI, Masayuki; KISHIMOTO, Tadashi. |
| マニュアスプレッダで散布された堆肥の乾物質量と窒素投入量の圃場内分布を評価するために，３つの 圃場で散布試験を実施した。供試堆肥の含水率は平均で５３～８１％と圃場ごとに大きな差異が見られ，その 変動係数はB とC 圃場が４．６％以内であったのに対し，A 圃場は９．４％以上とばらつきが大きかった。バー ク堆肥の窒素含有量は牛ふん堆肥に比べると少なく，その平均はA 圃場で１４．７g／kg, C 圃場で１６．８g／kg であった。圃場全体の堆肥の散布量と窒素投入量の変動係数はいずれの圃場でも４９％以上とばらつきが大 きかった。しかし，堆肥の含水率の変動が少ない圃場では，堆肥の現物質量と窒素投入量の分布形状がほ ぼ一致することから，圃場内の窒素投入量を均一にするためには，堆肥水分のばらつきを少なくし，かつ 堆肥散布精度を向上させることが必要であると考える。 In order to evaluate distribution variability of the dry weight and the amount of nitrogen input of the compost applied with manure spreaders, the experiments of compost application were carried out in three fields. The mean values of compost moisture content at three experimental fields range from 53 to 81%, and their differences between three fields were significant. The... |
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Palavras-chave: 堆肥散布機; 散布量分布; 窒素含有量; バーク堆肥; 牛ふん堆肥; Manure spreader; Distribution map; Nitrogen content; Bark compost; Cattle compost. |
| Ano: 2011 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3067 |
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| Bagheri,Nikrooz; Ahmadi,Hojjat; Alavipanah,Seyed Kazem; Omid,Mahmoud. |
| The objective of this work was to evaluate the use of multispectral remote sensing for site-specific nitrogen fertilizer management. Satellite imagery from the advanced spaceborne thermal emission and reflection radiometer (Aster) was acquired in a 23 ha corn-planted area in Iran. For the collection of field samples, a total of 53 pixels were selected by systematic randomized sampling. The total nitrogen content in corn leaf tissues in these pixels was evaluated. To predict corn canopy nitrogen content, different vegetation indices, such as normalized difference vegetation index (NDVI), soil-adjusted vegetation index (Savi), optimized soil-adjusted vegetation index (Osavi), modified chlorophyll absorption ratio index 2 (MCARI2), and modified triangle... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aster; Nitrogen content; Near infrared; Multispectral response; Precision agriculture; Vegetation indices. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001000011 |
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| Liu,ZG; Cai,YL; Li,K. |
| Induced responses to herbivory are physical, nutritional, and allelochemical traits that change in plants following disturbances, and reduce the performance and/or preference of leaf tissues on herbivores. This study gave evidence to the induced defense theory through the simulated herbivory in Schima superba, one of common dominant trees in subtropical evergreen, broadleaf forests in southern China. Results showed that leaves damaged at the beginning of leaf expansion would develop into having a larger area, higher toughness and higher tannin concentrations, but a lower water content compared with control leaves. As a result, they experienced lower herbivory rates than controls. These results indicate that simulated herbivory on leaves of S. superba (1)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Induced response; Herbivory; Simulated herbivory; Nitrogen content; Schima superba. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100012 |
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| Morais,Léa P. V. X. C. de; Bonfim-Silva,Edna M.; Pacheco,Adriano B.; Abreu,Joadil G. de; Silva,Tonny J. A. da; Polizel,Analy C.. |
| ABSTRACT This study aimed to evaluate the production and mineral nutrition of Piatã grass as a function of nitrogen and potassium fertilization in Oxisol collected in the Cerrado. The experiment was carried out in a greenhouse, the experimental design was completely randomized, in a 5 x 5 factorial scheme, corresponding to five nitrogen doses (0, 100, 200, 300 and 400 mg dm-3 of N) and five potassium doses (0, 90, 180, 270 and 360 mg dm-3 of K2O), with four replicates. Three cuts of the shoots were performed every 30 days. Chlorophyll index, dry mass of shoots and roots, and nitrogen and potassium contents in the leaves were evaluated. The dry mass of shoots showed interaction between nitrogen and potassium in the three cuts; in the second and third cuts,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; Nitrogen content; Potassium content; N:K ratio in plants. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001100984 |
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| Somporn Kamyot. |
| The research objectives were to investigate green manure species namely Crotalaria juncia on yield, yield components and nitrogen content of rice cv. Sangyodphatthalung was conducted in paddy soil condition of Phatthalung Soil Series. The experimental design was RCBD of which consisted of 7 treatments by using different seed rates (kg rai-1) as compared to chemical fertilizer i.e. 0, 5, 10, 15, 20, 25 and 8-10-0 kg N-P2O5-K2O rai-1. The results of yield showed that significantly different with different seed rates, the treatment of 15, 20, 25 kg rai-1 and CF gave similar highest average yield (386.8, 388.9, 385.7, 409.5 kg rai-1 respectively) and highest average number of no. of panicle hill-1, no. of spikelet panicle-1 and % of filled grain whereas the N... |
| Tipo: Collection |
Palavras-chave: Rice; Sangyodphatthalung rice; Green manure; Yield; Yield component; Nitrogen content; ข้าว; พันธุ์สังข์หยดพัทลุง; ปอเทือง; ปุ๋ยพืชสด; ผลผลิต; องค์ประกอบผลผลิต; ปริมาณไนโตรเจน. |
| Ano: 2012 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5373 |
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