. 2019 Sep 5;3(12):1900013. doi: 10.1002/gch2.201900013

Table 4.

Cost involved in the coating of boron, sulfur, and zinc onto prilled urea and economic evaluation for one hectare aromatic rice crop. Means in a column with at least one letter common are not statistically significant using Fisher's least significant difference

Treatment	Cost involved					Economic evaluation
	Quantity [kg ha⁻¹] of B/S/Zn required ^a)	Amount of borax/sulfur/Zn product [kg ha⁻¹] required ^a)	Cost of borax/sulfur/Zn [US $ ha⁻¹]	Cost of coating of urea with B/S/Zn ^b)	Total cost of coating urea of [US $ ha⁻¹]	Cultivation cost [US $ ha⁻¹]	Gross returns [US $ ha⁻¹]	Net returns [US $ ha⁻¹]	Benefit:cost ratio
Absolute control	–	–	–	–	–	983.5	1443.8^E	460.3^E	0.47^D
Prilled urea	–	–	–	–	–	1058.6	2057.9^D	999.4^D	0.94^C
0.1% BCU	0.28	2.33	4.67	2.08	6.75	1065.2	2128.2^CD	1063.0^CD	1.00^BC
0.2% BCU	0.56	4.66	9.32	2.40	11.72	1070.2	2170.3^BCD	1100.1^BCD	1.03^ABC
0.3% BCU	0.84	7.00	14.0	2.73	16.73	1075.1	2230.7^ABC	1155.6^ABC	1.07^AB
0.4% BCU	1.12	9.32	18.63	3.05	21.68	1080.0	2291.3^AB	1211.3^AB	1.12^AB
0.5% BCU	1.40	11.65	23.30	3.38	26.68	1085.0	2323.8^A	1238.8^A	1.14^A
Absolute control	–	–	–	–	–	983.5	1443.8^D	460.3^D	0.47^D
Prilled urea	–	–	–	–	–	1058.6	2057.9^C	999.4^C	0.94^C
1.0% SCU	2.83	3.14	1.57	1.85	3.42	1061.9	2144.9^BC	1082.9^BC	1.02^BC
2.0% SCU	5.65	6.28	3.13	1.97	5.10	1063.6	2288.9^B	1225.2^B	1.15^B
3.0% SCU	8.48	9.42	4.72	2.08	6.80	1065.3	2449.0^A	1383.7^A	1.30^A
4.0% SCU	11.30	12.56	6.28	2.18	8.47	1066.9	2486.1^A	1419.2^A	1.33^A
5.0% SCU	14.13	15.70	7.85	2.30	10.15	1068.6	2572.5^A	1503.9^A	1.41^A
Absolute control	–	–	–	–	–	983.5	1533.7^E	550.2^E	0.56^F
Prilled urea	–	–	–	–	–	1058.6	2169.4^D	1110.8^D	1.05^E
0.5% ZnCU (ZnSHH)	1.41	7.07	3.50	1.98	30.20	1064.0	2263.9^CD	1199.9^CD	1.13^DE
0.5% ZnCU (ZnO)	1.41	1.76	2.61	1.91	29.24	1063.1	2254.5^CD	1191.4^CD	1.12^DE
1.0% ZnCU (ZnSHH)	2.82	14.1	6.98	2.23	33.91	1067.8	2378.6^BC	1310.9^BC	1.23^BCD
1.0% ZnCU (ZnO)	2.82	3.52	5.23	2.10	32.05	1065.9	2371.9^BC	1303.3^BC	1.22^CD
1.5% ZnCU (ZnSHH)	4.23	21.15	10.48	2.46	37.66	1071.5	2460.8^AB	1389.3^AB	1.30^ABC
1.5% ZnCU (ZnO)	4.23	5.28	7.84	2.28	34.83	1068.7	2447.2^AB	1378.5^AB	1.29^ABC
2.0% ZnCU (ZnSHH)	5.64	28.2	13.96	2.71	41.39	1075.2	2528.1^A	1452.9^A	1.35^AB
2.0% ZnCU (ZnO)	5.64	7.04	10.46	2.46	37.64	1071.5	2509.9^A	1438.4^A	1.34^ABC
2.5% ZnCU (ZnSHH)	7.05	35.25	17.46	2.95	45.13	1079.0	2551.7^A	1472.8^A	1.36^A
2.5% ZnCU (ZnO)	7.05	8.81	13.09	2.64	40.45	1074.3	2537.4^A	1463.1^A	1.36^A

^{^a)}

For coating of 282.6 kg urea (kg ha⁻¹)

^{^b)}

At the rate of 7% of fertilizer prices (US $ ha⁻¹)

Prevailing prices of fertilizer materials during 2013&14: (i) Borax (12% boron) at the rate of US $ 2.0 kg⁻¹, (ii) sulfur dust (90% S) at the rate of US $ 0.50 kg⁻¹, (iii) ZnSO₄·7H₂O (20% Zn) at the rate of US $ 0.50 kg⁻¹; (iv) ZnO (80% Zn) at the rate of US $1.49 kg⁻¹, (v) prilled urea at the rate of US $ 0.087 kg⁻¹, (vi) price of one US $ = 60.6 INR [Note: Prilled urea at the rate of US $ 883 tonne⁻¹; US $ 24.97 for an application of 130 kg ha⁻¹].