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Nitrogen and potassium in the cultivation of Piatã grass in Brazilian Cerrado soil AGRIAMBI
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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WATER AVAILABILITY AND POTASSIUM DOSES IN CHERRY TOMATO QUALITY REA
Silva,Tonny J. A. da; Pacheco,Adriano B.; Bonfim-Silva,Edna M.; Duarte,Thiago F..
ABSTRACT The quality of cherry tomato fruits is directly related to the management strategies used in the production system, such as irrigation and fertilization. This study aimed to assess the quality of cherry tomato fruits cultivated under water availability and potassium fertilization. The experiment was carried out in a greenhouse in pots of 12 dm3 of an Oxisol. The experimental design was a randomized block design in a 52 fractional factorial arrangement with five water availabilities in the soil (4, 14, 24, 34, and 44 -kPa), five potassium doses (0, 125, 250, 375, and 500 mg dm−3) and with four blocks. Irrigation was performed with a semi-automated drip irrigation system with soil moisture monitoring by the Diviner 2000® capacitance probe. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil water; Diviner 2000; Lycopersicon esculentum; Mill.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000500657
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Yield and water use of cherry tomato under water availability and potassium doses AGRIAMBI
Pacheco,Adriano B.; Silva,Tonny J. A. da; Bonfim-Silva,Edna M.; Castro,Hamilton A. W.; Koetz,Marcio.
ABSTRACT The objective of this study was to evaluate the yield and water use of cherry tomatoes under soil water availability and potassium (K) doses in a greenhouse. The experiment was conducted in randomized blocks in a 52 fractional factorial design, corresponding to five levels of water availability and five K doses, with 13 combinations (4-0; 4-250; 4-500; 14-125; 14-375; 24-0; 24-250; 24-500; 34-125; 34-375; 44-0; 44-250; 44-500) (kPa-mg dm-3) and four replicates. A drip irrigation system with semi-automated irrigation control was used. The analyzed variables were shoot dry matter, number of fruits, yield, water consumption and water use efficiency. Highest cherry tomato yield occurs at soil water tension of 24 kPa and K dose of 290 mg dm-3. Soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lycopersicon esculentum Mill.; Available water; Potassium fertilization.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000500326
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