EFISIENSI PENGGUNAAN PUPUK ANORGANIK AKIBAT PENGGUNAAN PUPUK ORGANIK TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN JAGUNG (Zea mays L) DI TANAH ULTISOL

Abstract

 The research effects to obtain inorganic fertilizer use efficiency to the use of organic fertilizer on
the growth and yield of maize (Zea mays L) in Ultisol. This research was conducted
at the experimental field, the Laboratory for Research and Technology Faculty of
Agriculture, University of North Sumatra, Medan from August to November 2016. The
the design used in this study is a randomized block design factorial using two factors:
organic fertilizers (O) with treatment as follows: O0 = Without organic fertilizers,
O1 = 100% of doses of organic fertilizer, O2 = 75% of doses of organic fertilizer, O3
= 50% of doses of organic fertilizer, O4 = 25% of doses of organic fertilizer.
inorganic fertilizer application (A) with treatment as follows: A0 = Without
inorganic fertilizers, A1 = 100% of doses of inorganic fertilizer recommendations,
A2 = 75% of doses of inorganic fertilizer recommendations, A3 = 50% of doses of
inorganic fertilizer recommendations, A4 = 25% of doses of inorganic fertilizer
recommendations. The variables measured were: plant height, shoot dry weight, root
dry weight, dry seed weight. Results showed that 100% Organic fertilizer can
increase growth and yield of corn were higher in soil ultisol. This is indicated by
their real influence on the growth of plant height ages 8 and 12 WAP, the weight of
dry seed, uptake of N and P, but no significant effect on shoot dry weight, root dry
weight and uptake K. Inorganic fertilizer application of 100% can increase growth
and yield of corn was higher in soil ultisol. This is indicated by their real influence
on the growth of plant height age 8 WAP, root dry weight and the weight of dry seed,
but did not significantly affect plant height age of 12 WAP, shoot dry weight, uptake
of N, P and K. The interaction of the two combination treatments showed significantly
effect on the weight of dry seed.