a determination of the genetic variation of the fungus isolated from graminous weeds which is highly beneficial to know probable genetic recombination in the fungus populations was done for the first time in iran through pcr reaction. the isolates of fungus “magnaporthe grisea” from graminous weed hosts and from rice were analyzed through rapd-pcr to assay the mating type and genetic diversity....

Root responses to differences in availability of nitrogen and soil water were studied in loblolly pine (Pinus taeda L.) seedlings grown in monoculture and in competition with sweetgum (Liquidambar styraciflua L.) or crab grass (Digitaria spp.). Rhizotron cells were maintained at high soil water availability (approximately -0.1 MPa) or subjected to three dry-down cycles to low soil water availab...

The key to better nutrient efficiency is to simultaneously improve uptake and decrease losses. This study sought to achieve this balance using sorbent additions and manure nutrients (spent poultry litter; SL) compared with results obtained using conventional sources (Conv; urea nitrogen, N; and phosphate-phosphorus; P). Two experiments were conducted. Firstly, a phosphorus pot trial involving t...

While some research has been conducted in sub–Saharan Africa on the alien invasive Parthenium hysterophorus, little work assessed whether it is poses negative impact native forages. A field survey was carried out to study dominant co–existing plant species, and its abundance, forage cover. We found that non–natives were plants with P. hysterophorus compared natives. Plant species (r = -0.889, P...

O trabalho teve como objetivo realizar o estudo fitossociológico e a determinar os períodos de interferência das plantas daninhas na cultura do abacaxi em função espaçamento. As variáveis avaliadas da comunidade infestante foram: frequência, densidade, abundância, índice valor importância massa seca daninhas. Para foram determinadas produtividade abacaxizeiro ºBrix dos frutos. famílias botânica...

This note describes the detection of two contemporaneous mass feeding events a total ~1000 parrots. After report large numbers Turquoise Parrots Neophema pulchella being found on 8 May 2021, next day we encountered flocks totalling ~300 and ~700 Eastern Rosellas Platycercus eximius seeding grasses cattle property North-west Slopes New South Wales. The species, which congregated separately from ...