scholarly journals Seedlings production of Gomphrena globosaand Petunia x hybridain different times and substrates

2021 ◽  
Vol 17 (1) ◽  
pp. 44-55
Author(s):  
Miréli Duarte Bergmann ◽  
Carine Borges Batista ◽  
Francis Júnior Soldateli ◽  
Franciéle dos Santos Soares ◽  
Anderson Chuquel Mello ◽  
...  
Keyword(s):  
Root System ◽  
Rice Husk Ash ◽  
Dry Mass ◽  
Leaf Length ◽  
Production Costs ◽  
Experimental Unit ◽  
Aboveground Part ◽  
Growing Seasons ◽  
Randomized Experimental Design ◽  
Number Of Leaves

This study aimed to evaluate the seedlings growth of Petunia x hybridaand Gomphrena globosaat different times and substrates based on agricultural residues. A completely randomized experimental design was adopted, in a factorial scheme, with treatments consisting of four replications and the experimental unit formed by ten plants. The flower species Petunia x hybridaand G. globosawere cultivated in five substrate compositions and in two seasons, with sowing carried out in April and June for Petunia x hybridaand April and October for G. globosa. The substrates were composed using commercial substrate (CM), bovine manure (BM), worm humus (WM) and rice husk ash (HA), in volumetric proportions: (S1) 100% CS; (S2) 40% CS + 20% BM + 20% WH + 20% HA; (S3) 60% CS + 20% WH + 20% HA; (S4) 60% CS + 20% BM + 20% HA; and (S5) 80% CS + 20% BM. Emergence, emergence speed index, height, number of leaves, length of the largest leaf, length of the largest root, dry mass of the aboveground part, dry mass of the root system and total dry mass were evaluated. The seedlings growth of the Petunia x hybridaand G. globosachanged according to the characteristics of the substrates and the growing seasons. The substrate composed with 80% commercial substrate and 20% bovine manure showed similar or superior results to the commercial substrate and can be used in order to reduce production costs without prejudice to the seedlings growth. The cultivation of Petunia x hybridain April resulted in seedlings with greater height, leaf length and greater accumulation of phytomass. The G. globosa seedlings showed greater development of the aboveground part and the root system, in addition to greater accumulation of phytomass when cultivated in October.

scholarly journals Correction of soil compaction using wood ash in safflower crop

2019 ◽  
pp. 1375-1382
Author(s):  
Tulio Martinez Santos ◽  
Edna Maria Bonfim Silva ◽  
Tonny José Araújo da Silva ◽  
Ana Paula Alves Barreto Damasceno
Keyword(s):  
Bulk Density ◽  
Root System ◽  
Soil Compaction ◽  
System Development ◽  
Block Design ◽  
Dry Mass ◽  
Wood Ash ◽  
Experimental Unit ◽  
Root System Development ◽  
Randomized Block Design

Soil compaction is a big limitation to food production in agriculture. Wood ash is an agro-industrial residue generated by the burning of biomass in boilers for energy production. It can be used as a corrective agent and fertilizer of the soil. In this context, the objective of this study was to evaluate the root system of safflower cultivated under bulk density levels and wood ash doses in dystrophic Oxisol. The experiment was conducted in a greenhouse with a randomized block design under a 5x5 factorial scheme composed of 5 wood ash doses (0, 8, 16, 24, 32 g dm-3) and 5 bulk density levels (1.0, 1.2, 1.4, 1.6, 1.8 Mg m-3) with 4 replicates. The soil was collected from 0-0.20 m depth layer. Later it was incubated with the respective wood ash doses. Each experimental unit consisted of a pot made of three PVC (polyvinyl chloride) rings, in which the layers of 0.1-0.2 m were compacted. At 75 days after emergence, the plants were cut, their roots washed and the volume and dry mass checked. The results were submitted to analysis of variance and subsequent regression test, both at 5% probability. Soil densities negatively influenced the root system development and culture of safflower. Application of wood ash doses of 20 to 24 g dm-3 significantly improved root development of plant.

scholarly journals SELETIVIDADE DE MISTURAS DE HERBICIDAS E INSETICIDAS EM TANQUE APLICADAS EM HÍBRIDOS DE MILHO

2018 ◽  
Vol 17 (2) ◽  
pp. 287
Author(s):  
CLEBER DANIEL DE GOES MACIEL ◽  
ANDRÉ AUGUSTO PAZINATO DA SILVA ◽  
ENELISE OSCO HELVIG ◽  
ANTÔNIO MENDES DE OLIVEIRA NETO ◽  
NAIARA GUERRA ◽  
...  
Keyword(s):  
Zea Mays ◽  
Dry Mass ◽  
Development Stage ◽  
Initial Growth ◽  
Phenological Stages ◽  
Maize Hybrids ◽  
Randomized Experimental Design ◽  
Number Of Leaves ◽  
Chemical Groups ◽  
Chlorpyrifos Ethyl

 RESUMO - A associação de herbicidas e inseticidas é uma prática comum entre os agricultores, entretanto, muitas vezes pode provocar injúrias à cultura do milho. O trabalho teve como objetivo avaliar a seletividade de herbicidas em mistura em tanque com inseticidas de diferentes grupos químicos, no crescimento inicial de hibridos de milho. Dois experimentos foram conduzidos separadamente em estufa plástica com dois híbridos de milho (30F35 e 2B-710), utilizando como unidades experimentais vasos com duas plantas nos estádios fenológicos V3 e V6. O delineamento experimental foi o inteiramente casualizado, com cinco repetições. Foram avaliados 31 tratamentos, representados pela aplicação de seis herbicidas (atrazine, nicosulfuron, foramsulfuron + iodosulfuron, mesotrione, carfentrazone e 2,4-D, nas doses de 2000; 37,5; 36+2,4; 144; 10 e 1000 g ha-1, respectivamente) isolados e em mistura com quatro inseticidas (permethrin, methomyl, chlorpyrifos ethyl e novarulon, nas doses de 26,9; 64,5; 240 e 15 g ha-1, respectivamente) e uma testemunha sem aplicação. Avaliou-se a intoxicação das plantas aos 7 e 14 dias após a aplicação (DAA), o teor de clorofila das folhas, número médio de folhas por planta, massa seca da parte aérea e das raízes aos 14 DAA. Os resultados foram variáveis em função do híbrido e estádio fenológico na aplicação, sendo as misturas menos prejudiciais ao milho quando aplicadas em V3. Os tratamentos com atrazine foram os que menos afetaram o crescimento inicial dos híbridos. As misturas nicosulfuron + chlorpyrifos ethyl, mesotrione + chlorpyrifos ethyl e 2,4-D + chlorpyrifos ethyl foram as que mais prejudicaram o híbrido 30F35. Por outro lado, a mistura carfentrazone + chlorpyrifos ethyl foi a que mais afetou o crescimento inicial do híbrido 2B-710.Palavras-chave: fitointoxicação, antagonismo, estádio de desenvolvimento, Zea mays. SELECTIVITY OF HERBICIDES AND INSECTICIDES TANK MIXTURES APPLIED IN MAIZE HYBRIDS  ABSTRACT - The association of herbicides and insecticides despite often cause damage to the corn crop is a common practice among farmers. This study aimed to evaluate the initial selectivity of herbicides in tank mixture with insecticides from different chemical groups in maize. Two experiments were carried out in plastic greenhouse, using as experimental units pots with two maize hybrids (30F35 and 2B-710) in V3 and V6 phenological stages. A completely randomized experimental design was used, with five replications. Thirty-one treatments were represented by applying six herbicides (atrazine, nicosulfuron, foramsulfuron+iodosulfuron, mesotrione, carfentrazone and 2.4- D) isolated and in combination with the four insecticides (permethrin, methomyl, chlorpyrifos ethyl and novarulon) and a check without application. The phytointoxication was evaluated at 7 and 14 days after application (DAA), the chlorophyll content in leaves, total number of leaves, dry mass of the aerial part and roots at 14 DAA. The results were dependent of hybrid and corn stage in the application, and mixtures were less harmful when applied in V3 stage. The treatments with atrazine affected less the initial growth of the two hybrids. The mixtures of nicosulfuron+chlorpyrifos ethyl, mesotrione+chlorpyrifos ethyl and 2.4-D + chlorpyrifos ethyl were the most prejudicial to the hybrid 30F35. In addition, the carfentrazone + chlorpyrifos ethyl mixture was the most harmful to the initial growth of the hybrid 2B-710.Keywords: phytointoxication, antagonism, development stage, Zea mays.

scholarly journals Quality of pre-sprouted sugarcane seedlings grown on substrates with decomposed babassu palm stem

2021 ◽  
Vol 51 ◽  
Author(s):  
Romário Martins Costa ◽  
Marcos Renan Lima Leite ◽  
Sâmia dos Santos Matos ◽  
Rayssa Carolinne Mouzinho de Sousa ◽  
Raissa Rachel Salustriano da Silva-Matos ◽  
...  
Keyword(s):  
Growth And Development ◽  
Dry Mass ◽  
Quality Parameters ◽  
Point Of View ◽  
Production Costs ◽  
Economic Point ◽  
Babassu Palm ◽  
Number Of Leaves ◽  
The Cost

ABSTRACT The use of pre-sprouted seedlings in the implantation of sugarcane crops not only reduces the establishment period and production costs, but also has other advantages, such as a lesser requirement of propagules (stems) and greater phytosanitary control of the seedlings, when compared to conventional planting. Commercial substrates are also expensive and their use increases the cost of seedlings. This study aimed to evaluate the quality of sugarcane pre-sprouted seedlings grown on substrates with different proportions of decomposed babassu palm stem (DBPS), as well as to recommend the substrate formulation that provides the most favorable environment for the growth and development of sugarcane pre-sprouted seedlings. For preparation of the substrate (S), DBPS and soil were used in the following proportions: S1: 0 % of DBPS + 100 % of soil; S2: 20 % of DBPS + 80 % of soil; S3: 40 % of DBPS + 60 % of soil; S4: 60 % of DBPS + 40 % of soil; S5: 80 % of DBPS + 20 % of soil; S6: 100 % of DBPS + 0 % of soil. The use of S2 and S3 considerably improved the seedling quality parameters, such as sprout diameter and length, number of leaves and total, shoot and root dry mass. However, from an economic point of view, S2 is recommended for use.

scholarly journals Initial growth of cassava plants cv. Mossoró under different water regimes

2018 ◽  
Vol 12 (3) ◽  
pp. 191
Author(s):  
Domingos Ferreira De Mélo Neto ◽  
Daniel Gomes Coelho ◽  
Moab Torres De Andrade ◽  
Jandelson De Oliveira Alves
Keyword(s):  
Linear Trend ◽  
Experimental Period ◽  
Dry Mass ◽  
Experimental Unit ◽  
Initial Growth ◽  
Randomized Design ◽  
Severe Water Stress ◽  
Number Of Leaves ◽  
Use Efficiency ◽  
Irrigation Levels

The sprouting phase of cassava is critical for the establishment of the plant, with this phase being dependent on soil moisture. As such, this study evaluated the effect of different irrigation levels on the initial growth of cassava cv. Mossoró in semi-arid conditions. The experiment was conducted under completely randomized design conditions with 5 replications. The treatments in pots containing one plant per experimental unit consisted of 5 irrigation levels, 0, 25, 50, 75 and 100% of the reference evapotranspiration (ETo, mm day-1), which corresponded to totals for the experimental period of 11.20; 42.15; 73.09; 104.03 and 134.97 mm, respectively. At 30 days after planting, the number of leaves and stems, as well as the dry mass of the shoot and the root had increased sharply for irrigation levels up to 73.09 mm. For higher irrigation levels there was a tendency for plant growth stabilization; however, above 104.03 mm there was a decrease. Shoot and root dry mass ratio showed severe water stress at the 11.20 mm level, being more damaging to root growth. Plant height showed a positive linear trend as the level of irrigation was increased, as opposed to water use efficiency. Therefore, irrigation with 50% replacement of ETo (73.09 mm) provided the best conditions for early growth of cassava.

scholarly journals Tratamentos Pré-Germinativos na Emergência e Desenvolvimento Inicial de Plântulas de Graviola

2021 ◽  
Vol 25 (1) ◽  
pp. 72-76
Author(s):  
Marcus Vinicius Sandoval Paixão ◽  
Andrieli Ferrari Mônico ◽  
Rafaela Barreto Cazaroto Grobério ◽  
Gustavo Miranda Cremonini ◽  
Hélio Pena de Faria Junior ◽  
...  
Keyword(s):  
Seedling Emergence ◽  
Dry Mass ◽  
Experimental Unit ◽  
Annona Muricata ◽  
Initial Development ◽  
Efficient Treatment ◽  
Green Mass ◽  
Leaf Dry Mass ◽  
Number Of Leaves ◽  
Collar Diameter

A graviola, Annona muricata L., produz sementes que podem apresentar dormência ocasionada pela impermeabilidade do tegumento à água, necessitando assim de métodos para superação desta. Objetivou-se avaliar o efeito de tratamentos pré-germinativos na emergência e desenvolvimento inicial de plântulas de graviola. O delineamento experimental utilizado foi em blocos ao acaso, com 13 tratamentos e quatro repetições, sendo cada unidade experimental composta de 50 sementes. As sementes foram submetidas aos tratamentos com imersão por 30 minutos, os quais foram: água (26 °C testemunha), solução de giberelina a 1.000, 2.000, 3.000 e 4.000 mg.L-1, água com gelo em ponto de fusão (0 °C), congelador por 6 horas (-10 °C), geladeira por 24 horas (10 °C), água em ponto de ebulição (100 °C), solução de NaCl 9 g.L-1, solução de KCl 5 g.L-1, água de coco e suco de laranja. A semeadura ocorreu em tubetes 280 mL contendo substrato composto por solo+eterco bovino. Trinta dias após a semeadura (DAS) avaliou-se a porcentagem, índice de velocidade e tempo médio de emergência das plântulas. Sessenta dias após a semeadura foram avaliados: número de folhas; altura da planta; diâmetro do coleto; comprimento da raiz; massa verde foliar; massa seca foliar; massa verde e massa seca da raiz. O tratamento com giberelina de 4.000 mg.L-1 de GA3 foi o tratamento mais eficiente para induzir a emergência e desenvolvimento inicial de plântulas de graviola.   Palavras-chave: Annona muricata. Giberelina. Propagação.   Abstract Soursop, Annona muricata L., produces seeds that may present dormancy caused by the impermeability of the integument to water, thus requiring methods to overcome it. The objective was to evaluate the effect of pre-germinative treatments on the emergence and initial development of soursop seedlings. The experimental design used was in randomized blocks, with 13 treatments and four replications, each experimental unit consisting of 50 seeds. The seeds were submitted to immersion treatments for 30 minutes, which were: water (26°C control), 1.000 gibberellin solution, 2.000, 3.000 e 4.000 mg.L-1, water with ice at melting point (0 °C), freezer for 6 hours (-10 °C), refrigerator for 24 hours (10 °C), boiling water (100°C), NaCl 9 g.L-1 solution, KCl 5 g.L-1 solution, coconut water and orange juice. Sowing took place in 280 mL tubes containing substrate composed of soil + bovine manure. Thirty days after sowing (DAS), the percentage, speed index and mean seedling emergence time were evaluated. Sixty days after sowing the following items were evaluated: number of leaves; plant height; collar diameter; root length; leaf green mass; leaf dry mass; green mass and dry mass of the root. The treatment with gibberellin of 4.000 mg.L-1 of GA3 was the most efficient treatment to induce the emergence and initial development of soursop seedlings.   Keywords: Annona muricate. Gibberellin.  Propagation.

scholarly journals Seedlings of cassava varieties are responsive to organic fertilization

2019 ◽  
Vol 40 (5Supl1) ◽  
pp. 2151
Author(s):  
Inácio Mucutai Jala ◽  
Caeline Castor da Silva ◽  
Juraci Souza Sampaio Filho ◽  
Eder Jorge Oliveira ◽  
Rafaela Simão Abrahão Nóbrega
Keyword(s):  
Organic Fertilizer ◽  
Dry Mass ◽  
Production Costs ◽  
Organic Fertilizers ◽  
Healthy Plant ◽  
Initial Growth ◽  
Organic Fertilization ◽  
Randomized Design ◽  
Number Of Leaves ◽  
Cassava Varieties

In Brazil, there is already a recommendation for the production of cassava seed-cuttings for the production of seedlings originated from micropropagation, which may be extended for the production of seedlings obtained from cuttings from healthy plant stems, in order to avoid the spread of diseases. Therefore, it is essential to establish adequate cultivation substrates of easy acquisition which may stimulate the growth of seedlings, both to reduce the nursery period, as well as the seedling’s production costs. The objective of this work was to evaluate the effect of organic fertilizers made from bovine and goat manures, and tree pruning residues, to produce seedlings of three cassava varieties. The plots were set in a completely randomized design, with six replicates. The treatments consisted of three cassava genotypes (BRS Formosa, BRS Tapioqueira and BRS Kiriris) and five proportions of organic fertilizer: soil (0: 100, 20:80, 40:60, 60:40 and 80:20). The evaluations were performed 30 and 45 days after planting (DAP). There were isolated effects for shoot dry mass, total dry mass, leaf area and number of leaves. Interactions were verified for root length, chlorophyll a and total chlorophyll index, root dry mass and shoot dry mas/root dry mass ratio 45 DAP. The organic fertilizer stimulated the initial growth of cassava seedlings in the three varieties studied in the proportion of 50% of organic fertilizer and 50% of Latosol. Varieties BRS Formosa and BRS Kiriris showed the highest Dickson Quality Scores. Genotypes reacted efficiently to organic fertilization and can be propagated on these easily acquisition cultivation substrates.

scholarly journals Ruellia simplex cuttings propagation produced on carnauba waste substrate

2020 ◽  
Vol 14 ◽  
Author(s):  
Taciella Fernandes Silva ◽  
Klayton Antonio Do Lago Lopes ◽  
Janaiane Ferreira Dos Santos ◽  
Ana Paula De Almeida Sousa ◽  
Francisca Gislene Albano-Machado ◽  
...  
Keyword(s):  
Root System ◽  
Aerial Part ◽  
Ornamental Plants ◽  
Dry Mass ◽  
Fresh Mass ◽  
Randomized Design ◽  
Shoot Number ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Completely Randomized Design

The production of quality seedlings is necessary for the trading of ornamental plants. Seedling quality depends on several factors, among these factors, the substrate is highlighted. Thus, this study aimed to evaluate the effect of substrates based on bagana of carnauba, in the production of Ruellia simplex seedlings, by vegetative propagation. A completely randomized design was adopted, with six treatments and four replications. The treatments (substrates) were composed of bagana of carnauba (BC) and soil, in the following proportions: BC0 - 0% BC + 100% of soil; BC20 - 20% BC + 80% of soil; BC40 - 40% BC + 60% of soil; BC60 - 60% BC + 40% of soil; BC80 - 80% BC + 20% of soil; BC100 - 100% BC + 0% of soil. The plot consisted of a plant. After 45 days of cutting, it was evaluated: number of shoots; number of leaves per shoot; diameter of the highest shoot; length of the highest shoot; root length; inflorescence number; number of flowers per inflorescence; leaf area; root volume; aerial part fresh mass; root system fresh mass; aerial part dry mass; and root system dry mass. There was a significant difference for the variables, number of leaves per shoot, diameter and length of the highest shoot, number of flowers per inflorescence, fresh and dry mass of the aerial part. Having a direct relationship between the increase in the proportion of bagana of carnauba volume and the inflorescence number, the substrate 100% of bagana of carnauba is indicated.

scholarly journals Organic substrates and their effects on the emergence and initial growth of Tamarindus indica seedlings

2020 ◽  
Vol 11 (7) ◽  
pp. 83-92
Author(s):  
Genilda Canuto Amaral ◽  
Yara Karolynne Lopes Abreu ◽  
Mariana Duarte Silva Fonseca ◽  
Luciana De Souza Lorenzoni Paschoa ◽  
Elbya Leão Gibson ◽  
...  
Keyword(s):  
Root System ◽  
Quality Index ◽  
Organic Waste ◽  
Dry Mass ◽  
Additional Treatment ◽  
Initial Growth ◽  
Organic Substrates ◽  
Tamarindus Indica ◽  
Number Of Leaves ◽  
Ecologically Sustainable

The reuse of organic waste and destination as alternative substrates becomes an important strategy for the production of economically viable and ecologically sustainable forest seedlings. Thus, the objective of the study was to evaluate the influence of different substrates and compositions (proportions) on the emergence and initial growth of Tamarindus indica seedlings. For this, nine different substrates were formulated: bovine manure (EB), buriti paú (PB) and carnauba residue (RC) in the proportions of 75%, 50% and 25% complemented with washed sand and an additional treatment only with washed sand, considered as control. T. indica seeds were sown and conducted for 50 days. The following were evaluated: emergency speed index; mean emergence time, height of the shoot, diameter of the stem, number of leaves, length of the root system, dry mass of the shoot, dry mass of the root system, total dry mass and Dickson's quality index. For the variables of emergence of tamarind seeds, treatments with bovine manure and 25% buriti paú more efficient. In the growth of the seedlings, the best results of diameter, number of leaves, production of dry mass of the root system, aerial part or total part of the seedlings, in addition to Dickson's quality index were found in the proportion of 50% of bovine manure, followed by buriti paú. These results indicate that the substrates bovine manure and paú de buriti in the proportion 50% are the most suitable for the preparation of substrate for the production of T. indica seedlings.

scholarly journals Wood Ash as a Corrective and Fertilizer in Safflower Crop in Oxisol of Brazilian Cerrado

2018 ◽  
Vol 10 (9) ◽  
pp. 412
Author(s):  
Edna M. Bonfim-Silva ◽  
Tulio M. Santos ◽  
Luana G. A. Dourado ◽  
Camila T. R. Silva ◽  
William Fenner ◽  
...  
Keyword(s):  
Plant Height ◽  
Soil Ph ◽  
Dry Mass ◽  
Wood Ash ◽  
Stem Diameter ◽  
Experimental Unit ◽  
External Diameter ◽  
Brazilian Cerrado ◽  
Randomized Design ◽  
Number Of Leaves

This study aimed at estimating the wood ash as a corrective and fertilizer in the safflower crop. This study was done with respect to the development, growth, and production of safflower in response to the wood ash doses applied to Oxisol of the Brazilian Cerrado biome. Adopting the completely randomized design and using five wood ash doses (0, 8, 16, 24, 32 g dm-3) and six replicates, the experiments were performed under greenhouse conditions. Each experimental unit included a 2 dm3 pot, filled with soil that had been incubated earlier for 30 days. The variables studied included soil pH, plant height (cm), stem diameter (mm), number of leaves (plant-1), SPAD index, internal and external diameters of the chapters (cm), number of chapters (plant-1), chapters dry mass (g pot-1), shoot dry mass (g pot-1), volume (cm3 pot-1) and root dry mass (g pot-1) Analysis of variance and subsequent regression test were performed for all the data using SISVAR software, at 5% probability for both. The variables internal and external diameter of the chapters and root volume showed no significant differences. The soil pH revealed a significant effect of the wood ash application tending towards linearity, as did the other vegetative variables of plant height, stem diameter, number of leaves and SPAD index. The productive constituents exhibited improved development when the wood ash was applied to the soil in doses of around 24 g dm-3 or more.

scholarly journals Nutrient contents and growth of corn fertigated with human urine and cassava wastewater

2019 ◽  
Vol 23 (9) ◽  
pp. 681-686 ◽  
Author(s):  
Narcísio C. de Araújo ◽  
Vera L. A. de Lima ◽  
Geovani S. de Lima ◽  
Elysson M. G. Andrade ◽  
Jailton G. Ramos ◽  
...  
Keyword(s):  
Plant Height ◽  
Human Urine ◽  
Mineral Fertilizer ◽  
Dry Mass ◽  
Nitrogen And Phosphorus ◽  
Nutrient Contents ◽  
Randomized Experimental Design ◽  
Number Of Leaves ◽  
Fresh And Dry Mass ◽  
Cassava Wastewater

ABSTRACT This study aimed to evaluate the contents of macronutrients (NPK and S) and the growth of ‘Potiguar’ corn fertigated with human urine, cassava wastewater and their associations with NPK. The experiment was set up in greenhouse located on Campus I of Universidade Federal de Campina Grande. A completely randomized experimental design was used, consisting of eight treatments, corresponding to fertigation with mineral fertilizer NPK formula; organic, composed of yellow water, cassava wastewater and human urine associated with cassava wastewater; organomineral, composed of human urine associated with phosphorus and potassium, cassava wastewater associated with nitrogen and phosphorus and human urine associated with cassava wastewater and phosphorus, with five repetitions. At 50 days after sowing (DAS), plants were evaluated for the leaf NPK and S concentrations and growth variables: number of leaves, plant height, stem diameter, leaf area, fresh and dry mass of leaves, mass of stem and shoots. Nitrogen and phosphorus concentrations and the growth variables number of leaves, plant height, fresh and dry mass of leaves, mass of stem and of shoot were influenced by fertigation with human urine, cassava wastewater concentrations and their associations with NPK. In the leaves of corn cultivar Potiguar the accumulated concentrations of N, P and K, at 50 DAS, varied in the sequence N > K > P. Human urine has potential as source of N in fertigation of corn and cassava wastewater can be used if associated with other sources of nutrients.

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