Pengaruh pemupukan kalium dan pencucian serta interaksinya terhadap ketersediaan kalium dalam tanah.
1992
Sulaeman | Widjaya Adhi I.P.G. | Widjik S.I.M. | Mulyani S.N.
English. The influence of both K application and leaching on the availability of the concerned element was investigated in the laboratory. The investigation was a serial experiments which comprises of 3 series and using 27 plow layer paddy soil samples from various regions in Java. In experiment 1 and 2, the soils with 0, 100 and 200 ppm, K dosage were leached with water in percolation tubes accordingly. The concentrations of macro elements in the percolates were used to calculate the amounts of leached K, Na, Ca and Mg, and the K availability of the soil. Experiment 3 used an extraction method with 0.001 M CaCl2 solution containing 0 to 0.001 M KCl. The supernatant was used to measure the concentrations of macro elements and the K availability as predicted from Quantity-Intensity (Q/I) relationships. The results of study indicated that the amounts of the leached cations were governed both by their concentrations in soil solution and by soil buffering power of the elements. In experiments 1, the amount of K leached by 9 x 600 mm drainage water out of 4 soils under study was in the range of 15-123 K/ha. Experiment 2 applied 9 soils and 4 x 600 mm drainage water resulting in 12 to 123 kg leached K/ha. The value ranges of 0.2-26 percent and 2-23 percent of added K were leached from the soils with 100 and 200 ppm K dosage, respectively. Effect of K additions on Q/I parameters was as follow: labile K (Ko) increased with increasing added K, while K potential buffering capacity (PBC at the power of k) and K activity ratio in the equilibrium (AR at the power of k e) might either increase or decrease. If PBC at the power of k either remains content or decreases, the AR at the power of k e increases, and vice versa. With K applications available K reserve increased, but K availability did not, depends on the prevailing soil K buffering power. The K intensity value shoud be supported by an propriate soil K buffering power data in order to use it as an index of K availability for crops. PBC at the power of k is a specific of a soil and its magnitude proportional to clay content, clay CEC and Cadd + Mgdd content. The Q/I relationships give a better idea regarding the soil properties in connection with the K availability for crops.
Show more [+] Less [-]BAHASA: Pengaruh pemberian K dan pencucian terhadap ketersediaan unsur tersebut telah diteliti di laboratorium. Penelitian berupa serangkaian percobaan yang terdiri dari 3 seri dan menggunakan 27 contoh tanah sawah lapisan olah yang berasal dari berbagai daerah di Jawa.
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