Table 4. Calculated Values of the Photosynthetic Parameters, That Is, Net Photosynthetic Rate (P_N), Stomatal Conductance to Water Vapor (gs), and Transpiration Rate (E) by the Skewed and Gaussian Models for Different Leaf Positions during Limited Water Irrigation with Foliar Application of PSAP in Sugarcane Plants.

	Skewed model					Gaussian model
	PSAP (M)					PSAP (M)
leaf position	0	2	4	6	10	0	2	4	6	10
PN (μmol CO2 m–2 s–1)
1	13.382	15.775	17.564	20.069	20.040	13.883	16.283	17.776	20.293	20.110
2	13.382	15.740	16.808	19.140	18.493	13.010	15.193	16.418	18.748	18.360
3	12.569	14.179	14.783	16.837	16.348	11.922	13.767	14.743	16.791	16.351
4	10.187	11.650	12.606	14.321	14.123	10.685	12.113	12.871	14.579	14.206
5	8.940	9.963	10.747	12.097	11.998	9.364	10.351	10.925	12.271	12.041
6	8.437	9.001	9.249	10.245	10.025	8.026	8.588	9.016	10.012	9.955
gs (mmol H2O m–2 s–1)
1	91.275	97.256	123.354	128.989	129.225	92.749	98.018	124.207	130.959	130.112
2	91.117	97.234	119.442	128.222	125.263	88.697	96.556	117.753	127.067	124.123
3	81.961	91.825	105.198	118.202	112.618	80.054	89.327	104.959	116.142	112.239
4	64.798	75.326	86.551	99.170	95.464	68.191	77.611	87.959	100.000	96.203
5	52.320	60.691	68.478	79.633	77.651	54.820	63.329	69.306	81.109	78.160
6	44.836	51.186	52.596	63.104	60.878	41.594	48.530	51.342	61.972	60.192
E (mmol H2O m–2 s–1)
1	1.135	1.207	1.225	1.452	1.287	1.140	1.210	1.225	1.456	1.301
2	1.092	1.166	1.225	1.399	1.274	1.080	1.160	1.233	1.393	1.276
3	1.018	1.103	1.208	1.303	1.231	1.017	1.101	1.198	1.301	1.221
4	0.944	1.032	1.124	1.183	1.152	0.952	1.035	1.121	1.186	1.139
5	0.879	0.961	1.001	1.053	1.042	0.884	0.964	1.012	1.056	1.036
6	0.824	0.892	0.885	0.975	0.908	0.817	0.889	0.880	0.917	0.919