Yoshida - 1981 - Fundamentals of Rice Crop Science
Yoshida - 1981 - Fundamentals of Rice Crop Science
Yoshida - 1981 - Fundamentals of Rice Crop Science
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MINERAL NUTRITION OF RICE 129<br />
Table 3.11. Nutrient content and total uptake in 2 rice varieties at maturity. IRRI, 1968<br />
dry season. a Amount <strong>of</strong> nutrients Amount <strong>of</strong> nutrients<br />
Nutrient removed by 1 crop removed by 1 t<br />
Nutrient content in (kg/ha) rice<br />
Straw Panicle Total Panicle Total Panicle<br />
IR8<br />
N<br />
P<br />
K<br />
Ca<br />
Mg<br />
S<br />
CI<br />
Si<br />
Fe<br />
Mn<br />
B<br />
Zn<br />
Cu<br />
0.60%<br />
0.09<br />
3.07<br />
0.29<br />
0.27<br />
0.094<br />
1.06<br />
8.14<br />
470 ppm<br />
108<br />
55<br />
24<br />
3<br />
1.27%<br />
0.42<br />
0.68<br />
0.04<br />
0.14<br />
0.078<br />
0.13<br />
2.57<br />
111 ppm<br />
49<br />
24<br />
18<br />
3<br />
164<br />
46<br />
309<br />
27.3<br />
34.8<br />
14.7<br />
97.8<br />
890<br />
4.79<br />
1.32<br />
0.66<br />
0.35<br />
0.04<br />
116<br />
38<br />
62<br />
3.74<br />
13<br />
7.12<br />
12<br />
235<br />
1.01<br />
0.45<br />
0.22<br />
0.16<br />
0.03<br />
18.9 kg<br />
5.17<br />
35.5<br />
3.14<br />
3.99<br />
1.69<br />
11.2<br />
102<br />
551 g<br />
152<br />
76<br />
40<br />
6<br />
13.3 kg<br />
4.37<br />
7.13<br />
0.43<br />
1.49<br />
0.82<br />
1.38<br />
27.0<br />
116 g<br />
52<br />
25<br />
18<br />
3<br />
Peta<br />
N<br />
P<br />
K<br />
Ca<br />
Mg<br />
S<br />
CI<br />
Si<br />
Fe<br />
Mn<br />
B<br />
Zn<br />
cu<br />
0.62 %<br />
0.18<br />
2.43<br />
0.23<br />
0.21<br />
0.10<br />
1.06<br />
8.23<br />
256 ppm<br />
111<br />
55<br />
22<br />
2<br />
1.07 %<br />
0.20<br />
0.27<br />
0.044<br />
0.12<br />
0.075<br />
0.18<br />
3.04<br />
158 ppm<br />
41<br />
24<br />
15<br />
2<br />
143<br />
34.4<br />
308<br />
29.7<br />
32.2<br />
16.8<br />
117<br />
1018<br />
4.08<br />
1.59<br />
0.81<br />
0.36<br />
0.03<br />
68.5<br />
12.8<br />
17.3<br />
2.82<br />
7.68<br />
4.80<br />
11.3<br />
195<br />
1.01<br />
0.26<br />
0.15<br />
0.10<br />
0.01<br />
23.5 kg<br />
5.65<br />
50.6<br />
4.88<br />
5.29<br />
2.76<br />
19.2<br />
167<br />
670 g<br />
261<br />
133<br />
59<br />
5<br />
11.2 kg<br />
2.10<br />
2.84<br />
0.46<br />
1.26<br />
0.79<br />
1.86<br />
32.0<br />
166 g<br />
43<br />
25<br />
16<br />
2<br />
a The grain yields <strong>of</strong> IR8 and Peta were 8.70 and 6.09 t/ha, respectively (<strong>Yoshida</strong>, unpublished).<br />
IR8, an improved variety, has a higher harvest index than Peta, a tall, traditional<br />
variety. This characteristic is reflected in the partitioning <strong>of</strong> nutrients between<br />
panicle and straw. In IR8, the panicles remove 71% nitrogen and 83% phosphorus,<br />
whereas in Peta they remove 48% nitrogen and 37% phosphorus. The panicles <strong>of</strong><br />
IR8 and Peta remove only 20% and 6% potassium.<br />
The nutrients necessary to produce 1 t rough rice in the tropics are about 19–24 kg<br />
nitrogen with a mean value <strong>of</strong> 20.5 kg nitrogen, 4–6 kg phosphorus with a mean<br />
value <strong>of</strong> 5.1 kg phosphorus, and 35–50 kg potassium with a mean value <strong>of</strong> 44.4 kg<br />
potassium (Table 3.12). Similar information is also available for moderate and<br />
high yielding crops in Japan (Table 3.12).<br />
Despite a large difference in yield, the removal <strong>of</strong> nitrogen, phosphorus. and<br />
potassium is quite similar between moderate and high yielding crops. A compari-
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