Yazar
ian t twyford
3 cilt bulundu.
Cilt sonuçları
Fertilizer use at farm level in Pakistan
Ian T. Twyford · Govt. of Pakistan, Planning and Development Division, National Fertilizer Development Centre
226 sayfa · 1993
Agricultural surveys / Crop yields / Fertilizers
Role of phosphorus in crop production
Nisar Ahmad, M. Tahir Saleem, Ian T. Twyford · Govt. of Pakistan, Planning and Development Division, National Fertilizer Development Centre
487 sayfa · 1992
Plants / Effect of phosphorus on / Phosphorus in agriculture / Phosphatic fertilizers / Soils