Productive characteristics, nutrition and agronomic efficiency of polymer-coated MAP in lettuce crops

Chagas, Wantuir Filipe Teixeira; Emrich, Eduardo Bucsan; Guelfi, Douglas Ramos; Caputo, André Luiz Carvalho; Faquin, Valdemar

doi:10.5935/1806-6690.20150006

Acessibilidade / Reportar erro

Brasil

Revista Ciência Agronômica

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Soil Science • Rev. Ciênc. Agron. 46 (2) • Apr-Jun 2015 • https://doi.org/10.5935/1806-6690.20150006 copy

Productive characteristics, nutrition and agronomic efficiency of polymer-coated MAP in lettuce crops¹ Trabalho realizado com financiamento de bolsas da CAPES, CNPq e FAPEMIG concedidas a parte dos autores

Características produtivas, nutrição e eficiência agronômica do MAP revestido com polímeros em cultivos de alface

Authorship SCIMAGO INSTITUTIONS RANKINGS

In contrast to enhanced-efficiency nitrogen fertilisers, principally urea, phosphate fertilisers have been little studied and the available information is limited. The aim of this work therefore was to evaluate the productive and nutritional characteristics and the agronomic efficiency of a polymer-coated MAP fertilizer on two subsequent lettuce crops. The experiment was carried out in a greenhouse, in pots with a capacity of 4 kg, filled with a dystrophic yellow Latosol of a clayey texture. The experimental design was completely randomised and the treatments arranged in a 2 x 5 factorial scheme: two sources of phosphorus (P) (MAP and polymer-coated MAP), applied to the plots in five dosages (0, 100, 200, 400, 800 mg P₂O₅ kg^-1) with three replications. The results showed that the polymer-coated MAP increased the efficiency of the phosphate fertilizer in both lettuce crops, improving utilisation of the residual phosphorus. The agronomic efficiency of fertilization decreases with the increases in applied phosphorus. The production and nutritional characteristics of the lettuce were influenced by the levels of P₂O₅ and the use of MAP with polymers. Higher values for dry and fresh weight and for the accumulation of P in the first crop occurred with the use of polymer-coated MAP at dosages of 506.9, 450.1 and 522.8 mg kg^-1 P₂O₅.

Phosphate fertilizer; Residual effect; Lactuca sativa L

Source of variation	1st crop
Source of variation	FW	DW	NLP	LS	PC
Form of MAP	5.09^* * p<0.05;	2.59^ns	0.35^ns	7.14^ p<0.01	0.003^ns
Dosage	63.1^ p<0.01	31.2^ p<0.01	37.2^ p<0.01	59.0^ p<0.01	31.7^ p<0.01
Source x Dosage	4.79^ p<0.01	6.03^ p<0.01	6.78^ p<0.01	0.84^ns	1.43^ns
Mean	----------------- g pot^-1-----------------		-	cm	cm
Mean	105.5	10.9	13.6	3.5	33.8
CV (%)	10.8	11.9	6.7	9.7	6.1

Source of variation	1st crop
Source of variation	LP	PAc	AEI
Form of MAP	22.6^ p<0.01	18.4^ p<0.01	19.4^ p<0.01
Dosage	58.0^ p<0.01	58.2^ p<0.01	64.0^ p<0.01
Source x Dosage	6.46^ p<0.01	7.4^ p<0.01	12.8^ p<0.01
Mean	.............................................g kg^-1.................................................
Mean	1.3	15.6	7.3
CV (%)	12.0	16.3	22.3

Source of variation	2nd crop
Source of variation	FW	DW	NLP	LS	PC
Form of MAP	0.00^ns	82.7^ p<0.01	0.09^ns	12.31^ p<0.01	1.22^ns
Dosage	7.05^ p<0.01	3.99^* * p<0.05;	4.70^ p<0.01	1.14^ns	3.07^* * p<0.05;
Source x Dosage	1.49^ns	3.00^* * p<0.05;	0.78^ns	0.76^ns	0.78^ns
Mean	g pot^-1		-	cm	cm
Mean	39.3	6.6	13.5	1.7	32.9
CV (%)	22.5	29.1	9.0	18.4	11.4

Source of variation	2nd crop
Source of variation	LP	PAc	P _Mehlich	P-rem	AEI
Form of MAP	0.08^ns	27.3^ p<0.01	2.07^ns	0.71^ns	15.77^ p<0.01
Dosage	5.26^ p<0.01	3.44^* * p<0.05;	8.67^ p<0.01	2.07^ns	9.41^ p<0.01
Source x Dosage	1.17^ns	1.47^ns	1.94^ns	1.03^ns	4.33^* * p<0.05;
Mean	-----------------g kg^-1-----------------		---- mg pot^-1 ----	--------------- mg dm^-3----------------
Mean	1.2	8.7	21.5	4.9	3.8
CV (%)	24.1	51.9	122.3	34.8	89.7

Universidade Federal do Ceará Av. Mister Hull, 2977 - Bloco 487, Campus do Pici, 60356-000 - Fortaleza - CE - Brasil, Tel.: (55 85) 3366-9702 / 3366-9732, Fax: (55 85) 3366-9417 - Fortaleza - CE - Brazil
E-mail: ccarev@ufc.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] * Autor para correspondência

Chemical attributes ⁽¹⁾
pHwater	P	_K+	S	Zn	Cu	M	B	Fe	Ca2+	Mg²+	Al3+	(H+Al)	t	T	m	V	M.O	P-rem
pHwater	-------------------------mg dm^-3------------------------								-----------------cmol_cdm^-3 -----------------						--------- % -------			mg L^-1
5.0	0.8	8.0	13.1	0.5	2.2	3.9	0.04	25.1	0.4	0.1	0.0	2.1	0.5	2.6	0	20	1.5	2.3
Texture ⁽²⁾
Sand								Silt			Clay
----------------------------------------------------------------------------- % ----------------------------------------------------------------------------
19								14			67

Brasil

Brasil

Productive characteristics, nutrition and agronomic efficiency of polymer-coated MAP in lettuce crops1 Trabalho realizado com financiamento de bolsas da CAPES, CNPq e FAPEMIG concedidas a parte dos autores

Características produtivas, nutrição e eficiência agronômica do MAP revestido com polímeros em cultivos de alface

Productive characteristics, nutrition and agronomic efficiency of polymer-coated MAP in lettuce crops¹ Trabalho realizado com financiamento de bolsas da CAPES, CNPq e FAPEMIG concedidas a parte dos autores