Production of watercress with brackish water and different circulation times for the nutrient solution

Souza, Camila Alves de; Silva, Alexsandro Oliveira da; Santos, Jenyffer da Silva Gomes; Lacerda, Claudivan Feitosa de; Silva, Gerônimo Ferreira da

doi:10.5935/1806-6690.20200049

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Scientific Article • Rev. Ciênc. Agron. 51 (3) • 2020 • https://doi.org/10.5935/1806-6690.20200049 copy

Production of watercress with brackish water and different circulation times for the nutrient solution¹ 1 Artigo extraído da Dissertação do primeiro autor, apresentado ao Programa de Pós-Graduação em Engenharia Agrícola da Universidade Federal do Ceará/UFC

Produção de agrião com águas salobras e diferentes tempos de circulação da solução nutritiva

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In view of the limitations on good quality water, the use of low-quality water in agriculture is seen as a suitable alternative. The aim of this study was to evaluate, in a protected environment, the production of broadleaf watercress in an NFT (Nutrient Film Technique) hydroponic system as a function of the use of brackish water and different circulation times for the nutrient solution. The experiment was carried out in the experimental area of UFC, in Fortaleza, Ceará, from December 2018 to March 2019 (two crop cycles). The treatments were distributed in a randomised block design in a 5 x 2 factorial scheme, five levels of water salinity (0.6, 1.6, 2.6, 3.6 and 4.6 dS m^-1) and two circulation times for the nutrient solution (10 and 15 min), totalling 10 treatments with 4 replications, resulting in 40 experimental plots. The parameters under evaluation were plant height and number of leaves at 6, 10, 14, 20 and 25 days after transplanting (DAT), leaf area, shoot and root fresh weight, and shoot and root dry weight for each cycle. Water salinity maintained at 2.6 dS m^-1 was considered satisfactory for watercress production in both crop cycles under evaluation. A circulation time of 15 minutes for the nutrient solution gave the best results in the watercress at all levels of salinity.

Key words:
Nasturtium officinale; Irrigation water salinity; Vegetable

SV	DF	Mean Square
		------------------------------------------------- PH --------------------------------------------------
		6 DAT	10 DAT	14 DAT	20 DAT	25 DAT
		----------------------------------------------- Cycle 1 -----------------------------------------------
Block	3	0.17^ns	0.64^ns	2.06^ns	9.17^ns	-
Salinity	4	16.73**	117.60**	127.13**	116.11**	-
Period	1	1.59^ns	2.1^ns	1.26^ns	0.85^ns	-
Salinity*Period	4	0.47^ns	1.46^ns	7.26^ns	14.47**	-
Residual	27	0.85	1.94	2.69	2.98	-
CV (%)		7.40	8.85	8.93	8.45	-
		-------------------------------------------- Cycle 2 --------------------------------------------
Block	3	0.35^ns	1.82^ns	5.39^ns	1.02^ns	1.78^ns
Salinity	4	5.55^ns	3.19^ns	7.95^ns	17.57**	173.29**
Period	1	1.1^ns	0.99^ns	1.46^ns	0.062^ns	7.78^ns
Salinity*Period	4	1.08^ns	1.59^ns	1.31^ns	2.60^ns	3.82^ns
Residual	27	0.62	1.56	4.00	2.45	4.58
CV (%)		8.46	9.91	13.34	7.60	7.36
		------------------------------------------------- NL --------------------------------------------------
		---------------------------------------------- Cycle 1 ------------------------------------------------
Block	3	1.08ⁿs	0.64^ns	1.49^ns	19.16^ns	-
Salinity	4	5.92**	5.27*	31.89**	1117.39**	-
Period	1	1.6^ns	1.6^ns	0.025^ns	87.52*	-
Salinity*Period	4	0.77^ns	1.78^ns	3.75^ns	82.39**	-
Residual	27	0.52	1.06	3.06	14.99	-
CV (%)		6.34	8.26	11.34	9.28	-
		---------------------------------------------- Cycle 2 ------------------------------------------------
Block	3	1.14^ns	0.10^ns	0.90^ns	1.96^ns	44.17^ns
Salinity	4	0.96^ns	0.70^ns	1.94^ns	450.23**	1387.64**
Period	1	0.42^ns	5.25*	3.30^ns	72.63**	459*
Salinity*Period	4	0.36^ns	0.39^ns	0.57^ns	37.24**	112.99^ns
Residual	27	1.09	0.87	1.33	5.54	65.69
CV (%)		9.80	7.95	8.06	8.00	11.34

SV	DF	LA	RFW	RDW	SFW	SDW
Cycle 1
Block	3	0.000049^ns	0.84^ns	0.059^ns	1.91^ns	0.31^ns
Salinity	4	0.00105**	1.62^ns	0.062**	652.92**	10.99**
Time	1	0.000023^ns	0.69^ns	0.193**	31.38**	0.032^ns
Salinity*Time	4	0.00015^ns	2.38^ns	0.077**	15.29**	0.34*
Residual	27	0.00011	0.92	0.05	2.14	0.10
CV (%)		22.36	18.23	10.84	7.36	11.33
Cycle 2
Block	3	0.000224*	0.27^ns	0.025^ns	3.63^ns	0.078^ns
Salinity	4	0.002618**	17.74**	0.037^ns	681.12**	10.27**
Time	1	0.000397*	0.057^ns	0.193^ns	2.76^ns	0.011^ns
Salinity*Time	4	0.000759**	0.98*	0.046^ns	32.48^ns	0.34**
Residual	27	0.000061	0.24	0.016	14.05	0.64
CV (%)		18.26	7.57	21.70	14.86	7.50

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Production of watercress with brackish water and different circulation times for the nutrient solution1 1 Artigo extraído da Dissertação do primeiro autor, apresentado ao Programa de Pós-Graduação em Engenharia Agrícola da Universidade Federal do Ceará/UFC

Produção de agrião com águas salobras e diferentes tempos de circulação da solução nutritiva

ABSTRACT

Production of watercress with brackish water and different circulation times for the nutrient solution¹ 1 Artigo extraído da Dissertação do primeiro autor, apresentado ao Programa de Pós-Graduação em Engenharia Agrícola da Universidade Federal do Ceará/UFC