diff --git a/DESCRIPTION b/DESCRIPTION
index 5d13509d..13f98fd7 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: OBIC
 Type: Package
 Title: Calculate the Open Bodem Index (OBI) Score
-Version: 3.0.0
+Version: 3.0.1
 Authors@R: c(
     person(given = "Sven", 
            family = "Verweij",
@@ -27,7 +27,7 @@ Authors@R: c(
            family = "van den Dool",
            email = 'kees.vandendool@nmi-agro.nl',
            role = "aut",
-           comment = c(ORCHID = '0009-0003-8963-2556')),
+           comment = c(ORCID = '0009-0003-8963-2556')),
     person(given = "Job", 
            family = "de Pater",
            email = "job.depater@nmi-agro.nl",
diff --git a/NEWS.md b/NEWS.md
index 43cef0a2..e670b1f5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,7 @@
+# OBIC 3.0.1 2023-11-24
+## Fixed
+* Fixes calculation of N surplus used for I_H_NGW and I_H_NSW
+
 # OBIC 3.0.0 2023-10-16
 ## Added
 * Add `calc_permeability` for calculating top soil permeability 
diff --git a/R/nitrogen_efficiency.R b/R/nitrogen_efficiency.R
index 15962818..7e4545d6 100644
--- a/R/nitrogen_efficiency.R
+++ b/R/nitrogen_efficiency.R
@@ -132,7 +132,7 @@ calc_n_efficiency <- function(B_LU_BRP, B_SOILTYPE_AGR, B_GWL_CLASS, B_AER_CBS,
   dt[,catchcrop := fifelse(M_GREEN, 75,0)]
   
   # Calculate deviation from N surplus
-  dt[,n_sp := max(0,((1 - NUE * cf_pkph) * n_app) - catchcrop)]
+  dt[,n_sp := pmax(0,((1 - NUE * cf_pkph) * n_app) - catchcrop)]
   
   # compute (potential and soil derived) N leaching to groundwater D_NGW (mg NO3/L) 
   dt[, D_NLEACH := nf * n_sp]
diff --git a/tests/testthat/test-nitrogen_efficiency.R b/tests/testthat/test-nitrogen_efficiency.R
index d4d419d8..7c56b36e 100644
--- a/tests/testthat/test-nitrogen_efficiency.R
+++ b/tests/testthat/test-nitrogen_efficiency.R
@@ -13,7 +13,7 @@ test_that("test whether calc_nitrogen_efficiency works", {
                       B_FERT_NORM_FR = c(1,1,1,0.8),
                       leaching_to = 'gw'
     ),
-    expected = c(10.00, 11.25, 10.00, 10.00),
+    expected = c(3.92,  7.20, 10.00,  0.96),
     tolerance = 0.01
   )
   
@@ -31,7 +31,7 @@ test_that("test whether calc_nitrogen_efficiency works", {
                       B_FERT_NORM_FR = c(1,0.8,1,1),
                       leaching_to = 'gw'
     ),
-    expected = c(1.90,2.09,1.90,1.90),
+    expected = c(0.0, 0.0, 1.9, 0.0),
     tolerance = 0.01
   )