. 2014 May 15;9(5):e97288. doi: 10.1371/journal.pone.0097288

Table 2. The most important features involved in maize grain yield, selected by feature selection.

Rank	Field	Type	Importance	Value^*
1	Sowing date-country (days)	Set	Important	1.0
2	Stem dry weight (g plant⁻¹)	range	Important	1.0
3	Soil type	Set	Important	1.0
4	P applied (kg ha⁻¹)	range	Important	1.0
5	Kernel number per ear	range	Important	1.0
6	Final kernel weight (mg)	range	Important	1.0
7	Season duration (days)	range	Important	1.0
8	Soil pH	range	Important	1.0
9	Maximum kernel water content (mg)	range	Important	0.999
10	N applied (kg ha⁻¹)	range	Important	0.985
11	Cob dry weight (g plant⁻¹)	range	Important	0.980
12	Days to silking	range	Marginal	0.926
13	Density (kg ha⁻¹)	range	Unimportant	0.848
14	Hybrids type	Set	Unimportant	0.836
15	Kernel dry weight (mg)	range	Unimportant	0.702
16	Kernel growth rate (mg °C day⁻¹)	range	Unimportant	0.651
17	Duration of the grain filling period (°C day)	range	Important	0.622
18	Defoliation	Set	Unimportant	0.413
19	Leaf dry weight (g plant⁻¹)	range	Unimportant	0.299
20	Day (time of defoliation applied)	range	Unimportant	0.294
21	K applied ( kg ha⁻¹)	range	Unimportant	0.113

^*Values closer to 1 show the higher importance.