Novel Integrated Nanofertilizers for Improving the Growth of Polyscias fruticosa and Asparagus officinalis

Table 1

Chemical properties of the soil at the start and at the end of the experiment.

No.	Chemical properties	Unit	Methods	Result
				Before experiment	Control	Nanofertilizer
1.	Available P	mg/kg	TCVN 6499 : 1999	120	113	172
2.	Total P	mg/kg	TCVN 8559 : 2010	242	254	281
3.	S	mg/kg	TCVN 175 : 2015	—	20.16	13.28
4.	Available K	mg/kg	TCVN 8662 : 2011	59.4	73.2	81.3
5.	Si	mg/kg	US EPA method 3051: 2007 + SMEWW 3125 : 2017	374896	381569	400787
6.	Total organic C	mg/kg	TCVN 6634 : 2000	8000	12000	10400
7.	Total N	mg/kg	TCVN 6498 : 1999	2487	3357	2835
8.	Mg	mg/kg	US EPA method 3051: 2007 + SMEWW 3125 : 2017	3989	3701	3208
9.	Ca	mg/kg		13795	9522	10973
10.	Cu	mg/kg		22.71	19.36	19.77
11.	Fe	mg/kg		22576	18247	17384
12.	Zn	mg/kg		104.7	134.7	51.15
13.	Co	mg/kg		9.06	8.29	7.54
14.	Ag	mg/kg		0.66	0.32	0.42

TCVN: Vietnam National Standards.