RESUMOA infestação de plantas daninhas está entre os problemas de maior interferência na agricultura, e por isso tem despertado a utilização de técnicas de manejo, como o uso de solarização e coberturas vegetais sobre o solo, que podem atenuar essa problemática. Dessa forma, objetivou-se com este trabalho avaliar os manejos de solarização e cobertura morta do solo sobre a infestação de plantas daninhas no cultivo do feijão-caupi. O experimento foi realizado em casa de vegetação sob delineamento inteiramente casualizado com oito tratamentos, como sendo: solarização do solo (com e sem) e três coberturas mortas (mamona, crotalária e vegetação espontânea + ausência de cobertura) com quatro repetições. A pesquisa foi conduzida em vasos com capacidade de 11 dm 3 , preenchidos com oito kg de solo, e a semeadura realizada diretamente nos vasos. Aos 80 dias após a semeadura, foram determinados o número e a massa seca total de plantas daninhas em cada unidade experimental. Nesse período também foram avaliadas as características de crescimento e rendimento do feijão-caupi. O número e massa seca total de plantas daninhas foram maiores no solo sem cobertura, independente da solarização, sendo a massa seca total maior na ausência da solarização. Essa infestação de plantas daninhas reduziu o comprimento do ramo principal, número de folhas, número e comprimento de vagens, produção de massa seca e quantidade de água na parte aérea do feijão-caupi, enquanto aumentou a massa seca radicular. A solarização quando isolada não suprime totalmente a incidência de plantas daninhas, mas reduz o desenvolvimento destas. Por outro lado, a cobertura do solo, independente do tipo e da solarização, reduz a incidência de plantas daninhas favorecendo o crescimento, rendimento e produção de massa seca na parte aérea do feijão-caupi. PALAVRAS-CHAVE:Vigna unguiculata, plantas invasoras, rendimento. ABSTRACTWeed infestation is among the problems of greater interference in agriculture, and therefore has awakened the use of management techniques, as the use of solarization and mulching on the ground, that can mitigate this problem. Thus, was objectified with this work to evaluate the management of solarization and soil mulching on weed infestation in cowpea. The experiment was carried in greenhouse under a completely randomized design with eight treatments, such as: soil solarization (with and without) and three dead cover crops (castor bean, crotalaria and spontaneous vegetation + with four replications. The research was conducted in pots with a capacity of 11 dm 3 , filled with eight kg of soil, and the sowing was carried out directly in the pots. At 80 days after sowing, the number and total dry mass of weeds in each experimental unit were determined. During this period, the growth and yield characteristics of cowpea were also evaluated. The number and total dry mass of weeds were higher in the uncovered soil, independent of solarization, and the dry mass was higher in the absence of solarization. This weed infestation reduced the length of the main ...

More efficient weed control managements can be achieved through different strategies, given that the population of these plants changes according to the system used. This study aimed at assessing solarization methods associated with different mulches for weed control in the cowpea crop. The methods used were soil solarization, with plastic sheeting and with solar collector, associated with the following mulches: castor bean, rattlepod and spontaneous vegetation. Weed phytosociology was calculated by frequency, density and abundance. The most infesting families were Asteraceae, Poaceae and Amaranthaceae. The species with the highest frequency, density and abundance in the treatments without mulching was Cyperus rotundus, while Bidens spp. occurred only in non-solarized soil and without mulching. The largest number of weeds was found in the treatments without mulching in non-solarized soil or soil solarized with plastic sheeting, the latter being less efficient than the solar collector. Mulching inhibits the weed infestation in cowpea crops, irrespective of soil solarization. However, rattlepod as mulch is more efficient in the solarization with plastic sheeting than with a solar collector.

The growth and production of agricultural crops are greatly hampered by weed interference. The objective of this study was to evaluate weed infestation and growth and dry mass of cowpea cultivated in soil with solarization and mulching. The research was carried in the Agricultural Sciences Center of the Federal University of Alagoas, Rio Largo, AL. A completely randomized experimental design was used, with eight treatments and four replications. The treatments consisted of the combination of soil with and without solarization together with different mulching, such as T1: Os tratamentos consistiram da combinação de solo com e sem solarização junto a diferentes coberturas mortas, como sendo T1: solarized soil with mulching of castor bean, T2: solarized soil with mulching of rattlepod, T3: solarized soil with mulching of spontaneous vegetation, T4: solarized soil without mulching, T5: non-solarised soil with mulching of castor bean, T6: non-solarised soil with mulching of rattlepod, T7: non-solarised soil with mulching of spontaneous vegetation and T8: non-solarised soil and without mulching. The number of weeds was higher in treatments without mulching, independent of solarization, T4 and T8. Already, the growth of the plants and the number of bean leaves were higher in the solarized soil with mulching of castor bean, T1, and lower in the non-solarized soil and without mulching, T8, in contrary to the dry mass of the root. Solarization with solar collector when associated with mulching inhibits the infestation of weeds in cowpea, while its growth is benefited by solarization + mulching, by mulching without solarization, as well as the solarization without mulching.