CRESCIMENTO DE PINHÃO-MANSO EM FUNÇÃO DA ÁREA ÚTIL E DO CONSÓRCIO COM TIFTON 85

ResumoEste ensaio comparou o crescimento e a produção de frutos de Jatropha curcas L. em função do espaço de crescimento e da presença de Tifton 85. O ensaio foi constituído por arranjos circulares com quatro tratamentos de área útil por planta (1,57 m2, 3,92 m2, 6,28 m2 e 8,63 m2), com oito repetições, consorciado ou não com a herbácea Tifton 85. O cultivo solteiro de pinhão-manso com área útil de 6,28 m2 resultou em menor altura de plantas e maiores teores foliares de nitrogênio e fósforo, enquanto que a área útil de 1,57 m2 resultou em maior altura de plantas. Os menores valores para altura, número de folhas, número de frutos, índice SPAD e teores de nitrogênio e fósforo resultaram do plantio consorciado. Entretanto, a área útil de 1,57 m2 promoveu maiores diâmetros do caule. O diâmetro da copa apresentou os maiores valores em plantas crescendo com área útil de 3,92 m2, enquanto que com 1,57 m2 houve limitação na ampliação da copa. A produção máxima de frutos em cultivo solteiro foi alcançada aos 18 meses após o plantio, correspondente à estação quente do ano, independentemente dos espaçamentos de plantio.Palavras-chave: Cultivo consorciado; espaçamento de plantio; planta forrageira; Jatropha curcas L. AbstractGrowth and fruit production of physic nut as a function of plant growth area and Tifton 85. This essay compared development and fruit production of Jatropha curcas L. in relation to growing space and presence of an herbaceous competitor. The essay was composed by two circular plots with four plant growing areas (1.57 m2, 3.92 m2, 6.28 m2, and 8.63 m2) with eight replications for plot intercropped or not with Tifton 85. The cultivation of physic nut in the spacing of 6.28 m2 resulted in lower plant height and higher levels of leaf nitrogen and phosphorus, while the 1,57 m2 spacing resulted in increased plant height. The lowest values for plant height, number of leaves, number of fruits, SPAD index, and levels of nitrogen and phosphorus resulted in the intercropped plot. However, the 1.57 m2 spacing yelded higher stem diameter. Crown diameter presented the highest values in the 3.92 m2 spacing while the 1.57m2 limited the crown expansion. Maximum fruit production in monocrop plot was reached 18 months after planting date, which corresponded to the warmest season independently of planting space.Keywords: Intercropping; planting spacing; forage; Jatropha curcas L.

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Genetic Variability and Character Association for Oil Yield and Its Components in Physic Nut (Jatropha curcas L.)

Journal of Experimental Agriculture International ◽

10.9734/jeai/2019/v38i330303 ◽

2019 ◽

pp. 1-11

Author(s):

A. C. Odiyi ◽

E. F. Alegbeleye

Keyword(s):

Genetic Variability ◽

Plant Height ◽

Jatropha Curcas ◽

Seed Weight ◽

Environmental Influence ◽

Physic Nut ◽

Suitable Alternative ◽

Jatropha Curcas L ◽

Character Association ◽

Number Of Seeds

The need to find suitable alternative to fossil fuel necessitated the search for non-food oil crops like physic nut (Jatropha curcas L.). Improvement of the crop requires adequate knowledge of extent of genetic variability present. Therefore, a study was carried out to determine genetic variability and character association among forty local and exotic accessions of physic nut. The accessions were evaluated in two years in randomized complete block design with three replications. Results indicated highly significant variation among the accessions for all characters studied except plant height and number of seeds per fruit. High estimates of heritability were observed in number of leaves (84.10%) and seed oil (94.97%) while heritability was low in number of seeds (11.30%) and plant height (13.36%), other characters had moderate heritability. High heritability estimates were accompanied by relatively low genetic advance in all the traits except kernel oil, an indication that the character has high selection value with less environmental influence. Correlation analysis showed that tall plants produced bigger seeds because of the positive association between plant height and seed weight. Therefore, seed weight can be used as selection index.

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Global scaling the leaf nitrogen and phosphorus resorption of woody species: revisiting some commonly held views

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.147807 ◽

2021 ◽

pp. 147807

Author(s):

Miaoping Xu ◽

Yufan Zhu ◽

Shuohong Zhang ◽

Yongzhong Feng ◽

Wei Zhang ◽

...

Keyword(s):

Woody Species ◽

Leaf Nitrogen ◽

Nitrogen And Phosphorus ◽

Global Scaling ◽

Leaf Nitrogen And Phosphorus

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Influence of Height of Cane and Leaf Stage at Time of Sampling on Leaf-Nutrient Content of Sugarcane

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v44i1.12099 ◽

1969 ◽

Vol 44 (1) ◽

pp. 11-15

Author(s):

G. Samuels ◽

S. Alers-Alers ◽

P. Landrau, Jr.

Keyword(s):

Nutrient Content ◽

Leaf Nitrogen ◽

Sampling Time ◽

Nitrogen And Phosphorus ◽

Leaf Sample ◽

Leaf Stage ◽

Fertilizer Experiment ◽

Significant Difference ◽

Leaf Sampling ◽

Number Of Leaves

Leaf samples of sugarcane were taken from a fertilizer experiment at Río Piedras with varieties B. 41227 and M. 336 to determine whether the height of cane or the number of leaves present at leaf-sampling time influenced the nutrient content of the leaf sample. It was found that: 1. There was no significant difference in leaf nitrogen or potassium from cane tillers aged 3 months with heights of 12, 24, and 36 inches. 2. Variations in cane height at time of sampling did influence leaf-phosphorus values; there were increases in cane height. 3. The number of leaves present at time of sampling (7-13 weeks) did not influence leaf-nutrient values in general, except for nitrogen and phosphorus at 9 weeks of age. Here the trends of this influence with the two varieties studied were contrary.

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Morphophysiological Traits as Indicators of Genetic Diversity in Brazilian Populations of Jatropha curcas L. Grown Under Water Deficit

Journal of Agricultural Studies ◽

10.5296/jas.v8i3.16707 ◽

2020 ◽

Vol 8 (3) ◽

pp. 527

Author(s):

Leandro Dias da Silva ◽

Fábio Pinto Gomes ◽

Mateus Pires Barbosa ◽

Raul Antônio Araújo do Bonfim ◽

Mikaela Oliveira Souza ◽

...

Keyword(s):

Genetic Diversity ◽

Plant Height ◽

Principal Components ◽

Jatropha Curcas ◽

Biodiesel Production ◽

Physiological Traits ◽

Guaiacol Peroxidase ◽

Jatropha Curcas L ◽

Root Area ◽

Genetic Dissimilarity

Jatropha curcas L. (Euphorbiaceae) is a species grown in tropicalcountries and used for biodiesel production. Morphophysiological traits were analyzed to assess the genetic diversity in nine genotypes of J. curcas under deficit water. Seeds of plants from different populations, collected in diferente brazilian regions, were grown under two water regimes (100% and 50% tank capacity). Multivariate analysis was used to characterize genetic diversity. The UPGMA dendrogram built from the genetic distance group indicated the segregation of genotypes into five groups for growth traits and six groups for physiological traits. Then, an principal components analysis was carried out, to evaluate the pattern of character variations and then segregate the characteristics that could distinguish parental genotypes for use in plant breeding. Results showed 65.50% and 56.02% for the two first principal components of growth and physiological traits, respectively. Total root area was the most determining trait for genetic dissimilarity (18.9%) and group formation, followed by plant height (17.9%) and number of leaves (17.6%). On the other hand, stomatal conductance (gs) (24.9%) and guaiacol peroxidase (GPX) (20.9%) were the most determining physiological traits. The analysis of morphophysiological traits indicated CNPAE-298 and 299 as the most distant genotypes among the plant groups. Under water-limited conditions, total root area, plant height, gs and GPX were the most efficient traits to explain genetic dissimilarity among the genotypes, and for this reason they should be referred as a priority for further studies on genotypes selection in this species.

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