| Full text | |
| Author(s): |
Otto, Rafael
[1]
;
Ocheuze Trivelin, Paulo Cesar
[2]
;
Junqueira Franco, Henrique Coutinho
[2]
;
Faroni, Carlos Eduardo
[3]
;
Vitti, Andre Cesar
[4]
Total Authors: 5
|
| Affiliation: | [1] ESALQ USP, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, CENA, Lab Isotopos Estaveis, BR-13400970 Piracicaba, SP - Brazil
[3] Ctr Tecnol Canavieira, BR-13400970 Piracicaba, SP - Brazil
[4] Agencia Paulista Tecnol Agronegocios, Polo Reg Ctr, BR-13400970 Piracicaba, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Revista Brasileira de Ciência do Solo; v. 33, n. 3, p. 601-611, MAR-JUN 2009. |
| Web of Science Citations: | 28 |
| Abstract | |
Few studies on sugar cane have evaluated the root system of the crop, in spite of its importance. This is mainly due to the difficulty of evaluation and high variability of results. The objective of this study was to develop an evaluation method of the cane root system by means of probes so as to evaluate the mass, distribution and metabolically active roots related to N fertilization at planting. For this purpose, an experiment was conducted in an Arenic Kandiustults with medium texture in Jaboticabal/SP, in a randomized block design with four replications and four treatments: control (without N) and 40, 80 and 120 kg ha-1 of N applied in the form of urea in the planting furrow of the cane variety SP81 3250. One week before harvest, a urea-15N solution was applied at the cane stalk base to detect active metabolism in the root system. Trenches of 1.5 m length and 0.6 m depth were opened between two sugar cane rows for root sampling by two methods: monoliths (0.3, 0.2 and 0.15 m wide, deep and long respectively) taken from the trench wall and by probe (internal diameter 0.055 m). For each method, 15 samples per plot were collected. The roots were separated from the soil in a sieve (2 mm mesh), oven-dried (at 65 ºC) and the dry matter was measured. Root sampling by probes resulted in root mass that did not differ from the evaluation in monoliths, indicating that this evaluation method may be used for sugar cane root mass, although neither the root distribution in the soil profile nor the rhizome mass were efficiently evaluated, due to the small sample volume. Nitrogen fertilization at planting did not result in a greater root accumulation in the sugar cane plant, but caused changes in the distribution of the root system in the soil. The absence of N fertilization led to a better root distribution in the soil profile, with 50, 34 and 16 % in the 0-0.2, 0.2-0.4 and 0.4-0.6 m layers, respectively; in the fertilized treatments the roots were concentrated in the surface layer, with on average 70, 17 and 13 % for the same layers. The metabolically active roots were concentrated in the center of the cane stool, amounting to 40 % of the total root mass, regardless of N fertilization (application of 120 kg ha-1 N or without N). (AU) | |
| FAPESP's process: | 02/10534-8 - Sugar cane yield in subsequent cycles associated to the residual effect of N and S and their transformations in the soil, on conservation system |
| Grantee: | Paulo Cesar Ocheuze Trivelin |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 06/51251-0 - Accumulation of nutrients and development of sugarcane root system in different levels of nitrogenated fertilizer plantation applications and their relationship to the productivity of the CNA-plant and sugarcane rhizome |
| Grantee: | Rafael Otto |
| Support Opportunities: | Scholarships in Brazil - Master |