Banca de DEFESA: MARIA LUANA SOARES LOPES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA LUANA SOARES LOPES
DATE: 27/10/2023
TIME: 09:00
LOCAL: Garanhuns/PE- UFAPE
TITLE:

Agronomic and chemical-bromatological aspects of sorghum and cactus cactus genotypes cultivated in intercropping in the Semiarid region

KEY WORDS:

Animal Nutrition in the Semiarid, Caatinga, Forage farming

PAGES: 52
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
SPECIALTY: Manejo e Conservação de Pastagens
SUMMARY:

Seasonality in forage production, typically observed in the Semiarid region, is a limiting factor for ruminant production in the region. The consortium of forage cactus and sorghum can be a strategy to overcome the scarcity of forage and ensure food for animals during dry periods. Therefore, the objective of the present work was to evaluate the productive capacity and nutritional quality of sorghum and forage cactus consortiums under rainfed conditions, in order to identify the most advantageous alternative for the producer. To this end, a randomized block design was carried out in an area of the UFRPE Experimental Farm. Three sorghum genotypes (Sorghum bicolor) were evaluated - BRS-Ponta Negra, IPA-SF-15 and BRS-506 - in monoculture and in intercropping with forage cactus - Opuntia stricta Var. Orelha-de-elefante-Mexicana. At the end of the cycle, morphological data and samples were collected for chemical-bromatological evaluation in both cultures. The plants were cut and weighed to determine the fresh (PFM) and dry matter (PDM) productivity. The data were subjected to analysis of variance, and the means were compared using the Tukey test (5%). IPA-SF-15 stood out with the highest values for plant height (AP), stem diameter (DC), panicle length (CP) and PFM: 208.80 cm, 1.54 cm, 18.32 cm and 16,866.67 kg.ha^-1, respectively. However, in this genotype the lowest number of live tillers (NPV) and number of live leaves in tillers (NFVP) were found, 1.50 and 5.75, respectively. BRS-506 presented the highest results for NPV (4.31) and NFVP (15.80) and the lowest values for AP (113.31 cm), DC (1.05 cm), CP (9.96 cm), PFM (9,711.73 kg.ha^-1) and number of living leaves on the stem (NFVC) – 3.28. This was highlighted in BRS-Ponta Negra (4.75), which presented intermediate values of NPV (2.25) and CP (13.90 cm). The BRS-Ponta Negra did not differ (p>0.050) from the IPA-SF-15 in the variables DC, NFVC, NFVP and PMV, nor did it differ (p>0.050) from the BRS-506 in AP. Regarding bromatological composition, BRS-506 presented the highest dry matter (DM) and Ashes (ASH), thus the lowest organic matter (OM) content: 418.06 g/kg green matter, 35.17 g /kg DM and 964.82 g/kg DM, in that order. The consortium increased the ASH (p=0.014), the NPV (p=0.011), the NFVP (p=0.028), and the number of total live leaves (p=0.037) in sorghum varieties. In forage cactus, the consortium increased (p<0.050) the levels of ether extract, acid detergent fiber and cellulose, as well as the number of secondary (NCS) and total (NCT) cladodes. The PFM of forage cactus and sorghum were not affected by the cultivation system (p>0.050). Therefore, the stability in PFM and most bromatological variables, in both cultivation systems, indicates that the intercropping increases forage productivity, with minimal effect on the nutritional quality of forage cactus and sorghum varieties, which are shown to be with similar potential to increase the supply of forage in passive areas of instability in food security for animals.

COMMITTEE MEMBERS:
Interno - ALBERICIO PEREIRA DE ANDRADE
Externo à Instituição - DANIEL BARROS CARDOSO
Externa à Instituição - RAYANNE THALITA DE ALMEIDA SOUZA