茬高和季节对坦桑尼亚禾草形态、结构和数量性状的影响

IF 0.9 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Tropical Grasslands-Forrajes Tropicales Pub Date : 2021-09-30 DOI:10.17138/tgft(9)256-267

N. M. LAGE FILHO, Aline Lopes, A. C. do Rêgo, F. Domingues, C. Faturi, T. C. Da Silva, E. P. Cândido, Wilton Silva

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引用次数: 2

摘要

摘要本研究旨在评价亚马逊东部地区旱季和雨季不同茬高条件下几内亚草品种坦桑尼亚(Megathyrsus maximus, syn. Panicum maximum)的再生期、形态发生、结构和生产特征。处理分别为:5、15、25、35、45和55 cm SH，采用随机完全区组设计，共6个重复。在2个季节中，RP随SH的增加呈线性下降，而RS期明显缩短(47 d)，叶片外观率随SH的增加呈线性下降，从0.071叶/分蘖/d下降至0.051叶/分蘖/d，而RS期更高。SH的增加增加了叶片伸长率、茎伸长率和叶面积指数。在旱地，气候条件有利于形态形成，牧草积累量(8,693 kg DM/ha)高于旱地(2,597 kg DM/ha)。在将季节与SH联系起来时，我们建议将坦桑尼亚草在DS的SH为35 - 45 cm之间进行管理，可获得61 - 64天的RP，而在RS的SH为35 cm，可获得41天的RP。测试这种管理策略的研究似乎是有道理的。

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Effects of stubble height and season of the year on morphogenetic, structural and quantitative traits of Tanzania grass

The objective of this study was to evaluate regrowth period (RP), morphogenetic, structural and productive characteristics of the guinea grass cultivar Tanzania [Megathyrsus maximus (syn. Panicum maximum)] under different stubble heights (SH) during dry (DS) and rainy (RS) seasons in the eastern Amazon region. The treatments were: 5, 15, 25, 35, 45 and 55 cm SH, distributed in a randomized complete block design with 6 replicates. In the 2 seasons, RP decreased linearly with increase in SH, and was considerably shorter in the RS (47 d). Leaf appearance rate decreased linearly from 0.071 to 0.051 leaves/tiller/d with increasing SH, and it was higher during the RS. Increase in SH increased leaf elongation rate, stem elongation rate and leaf area index. In the RS, climatic conditions favored the morphogenesis, resulting in higher herbage accumulation (8,693 kg DM/ha) than in the DS (2,597 kg DM/ha). In associating seasons with SH, we recommend that Tanzania grass be managed at SH between 35 and 45 cm in the DS, resulting in RP from 61 to 64 days, and at SH of 35 cm in the RS, resulting in RP of 41 days. Studies to test this management strategy seem warranted.

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来源期刊

Tropical Grasslands-Forrajes Tropicales Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

1.60

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： The Journal publishes, in English or Spanish, Research Papers and Short Communications on research and development, as well as contributions from practitioners (Farmer Contributions) and Review Articles, related to pastures and forages in the tropics and subtropics. There is no regional focus; the information published should be of interest to a wide readership, encomprising researchers, academics, students, technicians, development workers and farmers. In general, the focus of the Journal is more on sown (''improved'') pastures and forages than on rangeland-specific aspects of natural grasslands, but exceptions are possible (e.g. when a submission is relevant for a particularly broad readership in the pasture and forage science community). The Journal will also consider the occasional publication of associated, but closely related, research in the form of an additional scientific communication platform [e.g. a re-make of the former Genetic Resources Communication series of the former Division of Tropical Crops and Pastures of the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia]. Areas of particular interest to the Journal are: Forage Genetic Resources and Livestock Production[...] Environmental Functions of Forages[...] Socio-economic Aspects[...] Topics within the aforementioned areas may include: Diversity evaluation; Agronomy; Establishment (including fertilization); Management and utilization; Animal production; Nutritive value; Biotic stresses (pests and diseases, weeds); Abiotic stresses (soil fertility, water, temperature); Genetics and breeding; Biogeography and germplasm collections; Seed production; Ecology; Physiology; Rhizobiology (including BNF, BNI, mycorrhizae); Forage conservation; Economics; Multilocational experimentation; Modelling.